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Re: Battery cable came off!
Michael Pardee wrote: > I think this is getting pretty far afield. Does anybody feel the alternator > would be stable under varying load with the battery disconnected? > Thanks for bringing it back, mike. I've been reading all the posts very closely. Anyway, as an update, no delayed effects yet, thankfully. Though I'm not willing to repeat the "experiment" anytime soon: Seems like I have a shorted rectifier in the alternator. (Does this mean that I'm getting voltage spikes all the time?) I'm wondering if the battery is now "absorbing" the spikes, so it seems to boil down again to whether the battery is acting as a large capacitor.. Thanks again to everyone. |
Re: Battery cable came off!
Michael Pardee wrote: > I think this is getting pretty far afield. Does anybody feel the alternator > would be stable under varying load with the battery disconnected? > Thanks for bringing it back, mike. I've been reading all the posts very closely. Anyway, as an update, no delayed effects yet, thankfully. Though I'm not willing to repeat the "experiment" anytime soon: Seems like I have a shorted rectifier in the alternator. (Does this mean that I'm getting voltage spikes all the time?) I'm wondering if the battery is now "absorbing" the spikes, so it seems to boil down again to whether the battery is acting as a large capacitor.. Thanks again to everyone. |
Re: Battery cable came off!
"sharx333" <emil.santos@gmail.com> wrote in message
news:1166300422.081048.241360@73g2000cwn.googlegro ups.com... > > Anyway, as an update, no delayed effects yet, thankfully. Though I'm > not willing to repeat the "experiment" anytime soon: Seems like I have > a shorted rectifier in the alternator. (Does this mean that I'm getting > voltage spikes all the time?) I'm wondering if the battery is now > "absorbing" the spikes, so it seems to boil down again to whether the > battery is acting as a large capacitor.. > > Thanks again to everyone. > In my experience, yes, you can expect to be getting ripple of about 1/2 volt to 1 volt even with the battery connected. It should be measurable with a DVM on AC voltage setting, measuring across the battery with the engine running. If diodes in two phases (out of the three phases most alternators use) fail the AC voltage can be over 1 1/2 volts with the battery connected. On an oscilloscope it looks pretty radical. With one phase out the voltage hangs around 14 volts and drops when the bad phase is called on to put out. With two phases out the voltage hangs around 12 volts and spikes upward. Mike |
Re: Battery cable came off!
"sharx333" <emil.santos@gmail.com> wrote in message
news:1166300422.081048.241360@73g2000cwn.googlegro ups.com... > > Anyway, as an update, no delayed effects yet, thankfully. Though I'm > not willing to repeat the "experiment" anytime soon: Seems like I have > a shorted rectifier in the alternator. (Does this mean that I'm getting > voltage spikes all the time?) I'm wondering if the battery is now > "absorbing" the spikes, so it seems to boil down again to whether the > battery is acting as a large capacitor.. > > Thanks again to everyone. > In my experience, yes, you can expect to be getting ripple of about 1/2 volt to 1 volt even with the battery connected. It should be measurable with a DVM on AC voltage setting, measuring across the battery with the engine running. If diodes in two phases (out of the three phases most alternators use) fail the AC voltage can be over 1 1/2 volts with the battery connected. On an oscilloscope it looks pretty radical. With one phase out the voltage hangs around 14 volts and drops when the bad phase is called on to put out. With two phases out the voltage hangs around 12 volts and spikes upward. Mike |
Re: Battery cable came off!
"sharx333" <emil.santos@gmail.com> wrote in message
news:1166300422.081048.241360@73g2000cwn.googlegro ups.com... > > Anyway, as an update, no delayed effects yet, thankfully. Though I'm > not willing to repeat the "experiment" anytime soon: Seems like I have > a shorted rectifier in the alternator. (Does this mean that I'm getting > voltage spikes all the time?) I'm wondering if the battery is now > "absorbing" the spikes, so it seems to boil down again to whether the > battery is acting as a large capacitor.. > > Thanks again to everyone. > In my experience, yes, you can expect to be getting ripple of about 1/2 volt to 1 volt even with the battery connected. It should be measurable with a DVM on AC voltage setting, measuring across the battery with the engine running. If diodes in two phases (out of the three phases most alternators use) fail the AC voltage can be over 1 1/2 volts with the battery connected. On an oscilloscope it looks pretty radical. With one phase out the voltage hangs around 14 volts and drops when the bad phase is called on to put out. With two phases out the voltage hangs around 12 volts and spikes upward. Mike |
Re: Battery cable came off!
"sharx333" <emil.santos@gmail.com> wrote in message
news:1166300422.081048.241360@73g2000cwn.googlegro ups.com... > > Anyway, as an update, no delayed effects yet, thankfully. Though I'm > not willing to repeat the "experiment" anytime soon: Seems like I have > a shorted rectifier in the alternator. (Does this mean that I'm getting > voltage spikes all the time?) I'm wondering if the battery is now > "absorbing" the spikes, so it seems to boil down again to whether the > battery is acting as a large capacitor.. > > Thanks again to everyone. > In my experience, yes, you can expect to be getting ripple of about 1/2 volt to 1 volt even with the battery connected. It should be measurable with a DVM on AC voltage setting, measuring across the battery with the engine running. If diodes in two phases (out of the three phases most alternators use) fail the AC voltage can be over 1 1/2 volts with the battery connected. On an oscilloscope it looks pretty radical. With one phase out the voltage hangs around 14 volts and drops when the bad phase is called on to put out. With two phases out the voltage hangs around 12 volts and spikes upward. Mike |
test post please ignore
On Sat, 16 Dec 2006 07:08:34 -0700, "Michael Pardee"
<michaeltnull@cybertrails.com> wrote: >I think this is getting pretty far afield. Does anybody feel the alternator >would be stable under varying load with the battery disconnected? > >Mike > test |
test post please ignore
On Sat, 16 Dec 2006 07:08:34 -0700, "Michael Pardee"
<michaeltnull@cybertrails.com> wrote: >I think this is getting pretty far afield. Does anybody feel the alternator >would be stable under varying load with the battery disconnected? > >Mike > test |
test post please ignore
On Sat, 16 Dec 2006 07:08:34 -0700, "Michael Pardee"
<michaeltnull@cybertrails.com> wrote: >I think this is getting pretty far afield. Does anybody feel the alternator >would be stable under varying load with the battery disconnected? > >Mike > test |
test post please ignore
On Sat, 16 Dec 2006 07:08:34 -0700, "Michael Pardee"
<michaeltnull@cybertrails.com> wrote: >I think this is getting pretty far afield. Does anybody feel the alternator >would be stable under varying load with the battery disconnected? > >Mike > test |
Re: Battery cable came off!
"Michael Pardee" <michaeltnull@cybertrails.com> wrote in
news:U7-dnQ-8-Lps_xnYnZ2dnUVZ_segnZ2d@sedona.net: > "sharx333" <emil.santos@gmail.com> wrote in message > news:1166300422.081048.241360@73g2000cwn.googlegro ups.com... >> >> Anyway, as an update, no delayed effects yet, thankfully. Though I'm >> not willing to repeat the "experiment" anytime soon: Seems like I >> have a shorted rectifier in the alternator. (Does this mean that I'm >> getting voltage spikes all the time?) I'm wondering if the battery is >> now "absorbing" the spikes, so it seems to boil down again to whether >> the battery is acting as a large capacitor.. >> >> Thanks again to everyone. >> > > In my experience, yes, you can expect to be getting ripple of about > 1/2 volt to 1 volt even with the battery connected. It should be > measurable with a DVM on AC voltage setting, measuring across the > battery with the engine running. If diodes in two phases (out of the > three phases most alternators use) fail the AC voltage can be over 1 > 1/2 volts with the battery connected. On an oscilloscope it looks > pretty radical. With one phase out the voltage hangs around 14 volts > and drops when the bad phase is called on to put out. With two phases > out the voltage hangs around 12 volts and spikes upward. > > Mike > > > Applying AC straight from one phase of the alternator's output would harm the battery,causing excessive heating.On one-half of a cycle,the battery would charge just like the other phase outputs,but on the 2nd half cycle,it would discharge(thru the ALT),maybe even provide a path for damaging currents to be drawn from the battery.It depends on whether the diode failed open or short/leaky. Open failure would just remove that phase winding's output,lowering the alternator's total output current,and giving more ripple. -- Jim Yanik jyanik at kua.net |
Re: Battery cable came off!
"Michael Pardee" <michaeltnull@cybertrails.com> wrote in
news:U7-dnQ-8-Lps_xnYnZ2dnUVZ_segnZ2d@sedona.net: > "sharx333" <emil.santos@gmail.com> wrote in message > news:1166300422.081048.241360@73g2000cwn.googlegro ups.com... >> >> Anyway, as an update, no delayed effects yet, thankfully. Though I'm >> not willing to repeat the "experiment" anytime soon: Seems like I >> have a shorted rectifier in the alternator. (Does this mean that I'm >> getting voltage spikes all the time?) I'm wondering if the battery is >> now "absorbing" the spikes, so it seems to boil down again to whether >> the battery is acting as a large capacitor.. >> >> Thanks again to everyone. >> > > In my experience, yes, you can expect to be getting ripple of about > 1/2 volt to 1 volt even with the battery connected. It should be > measurable with a DVM on AC voltage setting, measuring across the > battery with the engine running. If diodes in two phases (out of the > three phases most alternators use) fail the AC voltage can be over 1 > 1/2 volts with the battery connected. On an oscilloscope it looks > pretty radical. With one phase out the voltage hangs around 14 volts > and drops when the bad phase is called on to put out. With two phases > out the voltage hangs around 12 volts and spikes upward. > > Mike > > > Applying AC straight from one phase of the alternator's output would harm the battery,causing excessive heating.On one-half of a cycle,the battery would charge just like the other phase outputs,but on the 2nd half cycle,it would discharge(thru the ALT),maybe even provide a path for damaging currents to be drawn from the battery.It depends on whether the diode failed open or short/leaky. Open failure would just remove that phase winding's output,lowering the alternator's total output current,and giving more ripple. -- Jim Yanik jyanik at kua.net |
Re: Battery cable came off!
"Michael Pardee" <michaeltnull@cybertrails.com> wrote in
news:U7-dnQ-8-Lps_xnYnZ2dnUVZ_segnZ2d@sedona.net: > "sharx333" <emil.santos@gmail.com> wrote in message > news:1166300422.081048.241360@73g2000cwn.googlegro ups.com... >> >> Anyway, as an update, no delayed effects yet, thankfully. Though I'm >> not willing to repeat the "experiment" anytime soon: Seems like I >> have a shorted rectifier in the alternator. (Does this mean that I'm >> getting voltage spikes all the time?) I'm wondering if the battery is >> now "absorbing" the spikes, so it seems to boil down again to whether >> the battery is acting as a large capacitor.. >> >> Thanks again to everyone. >> > > In my experience, yes, you can expect to be getting ripple of about > 1/2 volt to 1 volt even with the battery connected. It should be > measurable with a DVM on AC voltage setting, measuring across the > battery with the engine running. If diodes in two phases (out of the > three phases most alternators use) fail the AC voltage can be over 1 > 1/2 volts with the battery connected. On an oscilloscope it looks > pretty radical. With one phase out the voltage hangs around 14 volts > and drops when the bad phase is called on to put out. With two phases > out the voltage hangs around 12 volts and spikes upward. > > Mike > > > Applying AC straight from one phase of the alternator's output would harm the battery,causing excessive heating.On one-half of a cycle,the battery would charge just like the other phase outputs,but on the 2nd half cycle,it would discharge(thru the ALT),maybe even provide a path for damaging currents to be drawn from the battery.It depends on whether the diode failed open or short/leaky. Open failure would just remove that phase winding's output,lowering the alternator's total output current,and giving more ripple. -- Jim Yanik jyanik at kua.net |
Re: Battery cable came off!
"Michael Pardee" <michaeltnull@cybertrails.com> wrote in
news:U7-dnQ-8-Lps_xnYnZ2dnUVZ_segnZ2d@sedona.net: > "sharx333" <emil.santos@gmail.com> wrote in message > news:1166300422.081048.241360@73g2000cwn.googlegro ups.com... >> >> Anyway, as an update, no delayed effects yet, thankfully. Though I'm >> not willing to repeat the "experiment" anytime soon: Seems like I >> have a shorted rectifier in the alternator. (Does this mean that I'm >> getting voltage spikes all the time?) I'm wondering if the battery is >> now "absorbing" the spikes, so it seems to boil down again to whether >> the battery is acting as a large capacitor.. >> >> Thanks again to everyone. >> > > In my experience, yes, you can expect to be getting ripple of about > 1/2 volt to 1 volt even with the battery connected. It should be > measurable with a DVM on AC voltage setting, measuring across the > battery with the engine running. If diodes in two phases (out of the > three phases most alternators use) fail the AC voltage can be over 1 > 1/2 volts with the battery connected. On an oscilloscope it looks > pretty radical. With one phase out the voltage hangs around 14 volts > and drops when the bad phase is called on to put out. With two phases > out the voltage hangs around 12 volts and spikes upward. > > Mike > > > Applying AC straight from one phase of the alternator's output would harm the battery,causing excessive heating.On one-half of a cycle,the battery would charge just like the other phase outputs,but on the 2nd half cycle,it would discharge(thru the ALT),maybe even provide a path for damaging currents to be drawn from the battery.It depends on whether the diode failed open or short/leaky. Open failure would just remove that phase winding's output,lowering the alternator's total output current,and giving more ripple. -- Jim Yanik jyanik at kua.net |
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