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> Generator Light, Is On
EdwardBlume
post May 18 2017, 12:25 PM
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Was driving last week and the generator light came on, went off, came on again, and then it stayed on.

Belt is on, VR was swapped with another I have around (and another is on the way), ground at the tranny is connected and good, battery charged and tightened, fuses 8 & 9 are good and new, spun to make sure they are connected.

Voltage meter is showing 12 to 13.

Anything else I can troubleshoot before I pull the generator? (IMG:style_emoticons/default/dry.gif)
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EdwardBlume
post May 18 2017, 12:26 PM
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And its running fine.....
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BillC
post May 18 2017, 12:35 PM
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Check the voltage at the battery using a DVOM. Should be about 12-12.5V with the car off and about 13.5-14.2 with the car running.

If the voltage is low with the car running, then either the regulator or the alternator are bad.
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Elliot Cannon
post May 18 2017, 12:35 PM
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Check the voltage at the battery with the engine running. It should be 14+ volts. It looks like you have eliminated most everything but that.
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EdwardBlume
post May 18 2017, 12:51 PM
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Thanks guys. The battery is coming through at 12.2 off and running at idle 13.65. Does that mean it's charging?
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porschetub
post May 18 2017, 02:16 PM
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IF the voltage is higher when running you have charge,do a load test,lights on ,stereo on,fan blower on max.................... this will tell you whats really happening,don't trust the amps gauge,put your meter directly on the battery,good luck.
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EdwardBlume
post May 18 2017, 03:50 PM
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QUOTE(porschetub @ May 18 2017, 01:16 PM) *

IF the voltage is higher when running you have charge,do a load test,lights on ,stereo on,fan blower on max.................... this will tell you whats really happening,don't trust the amps gauge,put your meter directly on the battery,good luck.

With the lights on and wipers going (no radio currently) at idle, I'm getting 11.8 on the battery.
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Elliot Cannon
post May 18 2017, 07:40 PM
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QUOTE(Edward Blume @ May 18 2017, 02:50 PM) *

QUOTE(porschetub @ May 18 2017, 01:16 PM) *

IF the voltage is higher when running you have charge,do a load test,lights on ,stereo on,fan blower on max.................... this will tell you whats really happening,don't trust the amps gauge,put your meter directly on the battery,good luck.

With the lights on and wipers going (no radio currently) at idle, I'm getting 11.8 on the battery.


What does it read when you rev the engine above idle?
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EdwardBlume
post Jun 21 2017, 07:06 PM
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New alternator, battery, and voltage regulator. Still on... (IMG:style_emoticons/default/headbang.gif)
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porschetub
post Jun 21 2017, 11:26 PM
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QUOTE(Edward Blume @ Jun 22 2017, 01:06 PM) *

New alternator, battery, and voltage regulator. Still on... (IMG:style_emoticons/default/headbang.gif)


Darn got a similar mystery tried 3 VR's,until I pull my altenator I don't know,in a six bit of a mission,charge is just above battery when running but not a lot ,been rebuilt ???????.
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Kansas 914
post Jun 22 2017, 06:34 AM
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You don't have an LED in the gauge do you?
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Krieger
post Jun 22 2017, 07:57 AM
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Test the wire after the vr back to the light. Is this the wire that has a resistor in it near the gauge?
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EdwardBlume
post Jun 22 2017, 10:45 AM
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QUOTE(Kansas 914 @ Jun 22 2017, 05:34 AM) *

You don't have an LED in the gauge do you?

No. Dad's car is mostly stock.
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EdwardBlume
post Jun 22 2017, 10:48 AM
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QUOTE(Krieger @ Jun 22 2017, 06:57 AM) *

Test the wire after the vr back to the light. Is this the wire that has a resistor in it near the gauge?

Will do. I'm going to test the alternator I just pulled out today.
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rhodyguy
post Jun 22 2017, 11:03 AM
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Good used (tested) or new on the alt change?
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EdwardBlume
post Jun 22 2017, 03:41 PM
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QUOTE(rhodyguy @ Jun 22 2017, 10:03 AM) *

Good used (tested) or new on the alt change?

Good used off a working motor. Maybe 1000 miles. Old Bosch part circa 2001.
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EdwardBlume
post Jun 22 2017, 04:18 PM
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Here's the one I pulled. Looks like the boot melted. Is this normal? Or a sign of failure?


Attached thumbnail(s)
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rhodyguy
post Jun 23 2017, 07:30 AM
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Are there arching marks on the inside face of the rear cover?
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GregAmy
post Jun 23 2017, 07:49 AM
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QUOTE(Edward Blume @ Jun 22 2017, 06:18 PM) *

Here's the one I pulled. Looks like the boot melted. Is this normal? Or a sign of failure?

A melted boot, thus heat, may be a sign of increased resistance from a bad connection. It's possible the large wire connection there was rusty or not very good. I'd clean all that up, ensure a nice clean connection, ensure a good solid wire ring end, use some dieletric grease and see how well it works.
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914Tom
post Jun 23 2017, 08:00 AM
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only my 2c. If Voltage is correct an it is so. Alternator, Battrey and Voltage Reg. is OK.
There can only be a whiring, maybe ground, issue with the Light.
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