GMCforum: GMCnet » Alternator/Isolator/Battery Problems/Questions

Home » Public Forums » GMCnet » Alternator/Isolator/Battery Problems/Questions

Show: Today's Messages :: Polls :: Message Navigator

Re: Alternator/Isolator/Battery Problems/Questions [message #247648 is a reply to message #247637]

Wed, 16 April 2014 19:09

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma:

Senior Member

gbarrow wrote on Wed, 16 April 2014 18:21

Ken,
I took the readings per your instructions. At step 1 the alt was putting out over 16 volts.

I removed the alt took it to Auto Zone it failed the test on their machine. They replaced the alternator under the warranty.

New alternator also puts out 16 volts. The GOOD bulb in the alternator indicator does not light when key is turned on before starting.

Voltage at the alt wire connecting to the gauge cluster in the dash is 0 with key off 12+ with key on 14+ with engine running. So I assume the bulb not lighting is a problem with gauge cluster circuit board or contact points on light slot on the board.

Isolator readings are as anticipated from your flow chart except that the alt wire when disconnected from isolator with engine not running still reads 12+ volts.

Isolator is new- alternator is rebuilt-
How does one verify that the sense wire is functioning? How does the light failure affect the sense wire system?

Do you mean that the heavy lead from the alternator shows ~12V when disconnected from the center terminal of the isolator with the engine off???

That just cannot happen with a good alternator.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

Report message to a moderator

[Message index]

		Alternator/Isolator/Battery Problems/Questions By: gbarrow2 on Mon, 14 April 2014 20:22
		Re: Alternator/Isolator/Battery Problems/Questions By: Ken Burton on Mon, 14 April 2014 21:46
		Re: Alternator/Isolator/Battery Problems/Questions By: gbarrow2 on Wed, 16 April 2014 17:21
		Re: Alternator/Isolator/Battery Problems/Questions By: Otterwan on Wed, 16 April 2014 17:26
		Re: Alternator/Isolator/Battery Problems/Questions By: gbarrow2 on Wed, 16 April 2014 18:06
		Re: Alternator/Isolator/Battery Problems/Questions By: Otterwan on Wed, 16 April 2014 18:24
		Re: [GMCnet] Alternator/Isolator/Battery Problems/Questions By: Mr ERFisher on Wed, 16 April 2014 19:09
		Re: Alternator/Isolator/Battery Problems/Questions By: Matt Colie on Wed, 16 April 2014 19:09
		Re: Alternator/Isolator/Battery Problems/Questions By: Ken Burton on Wed, 16 April 2014 20:15
		Re: Alternator/Isolator/Battery Problems/Questions By: Ken Burton on Thu, 17 April 2014 06:57
		Re: Alternator/Isolator/Battery Problems/Questions By: WildBill on Wed, 16 April 2014 19:10
		Re: Alternator/Isolator/Battery Problems/Questions By: WildBill on Wed, 16 April 2014 23:10

Previous Topic:	Power cord length
Next Topic:	[GMCnet] Cell phone repeater

Goto Forum:

-=] Back to Top [=-

Current Time: Fri May 17 16:27:05 CDT 2024

Total time taken to generate the page: 0.01413 seconds