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Re: [GMCnet] Help near Springfield, MO [message #326610 is a reply to message #326604] Fri, 01 December 2017 17:45 Go to previous messageGo to previous message
Emery Stora is currently offline  Emery Stora   United States
Messages: 959
Registered: January 2011
Karma:
Senior Member
Tom

Glad to hear that you have it working.
As your batteries charge up the voltage should drop a bit.

Emery Stora
77 Kingsley
Frederick, CO

> On Dec 1, 2017, at 3:38 PM, Tom Lins wrote:
>
> Tom Lins wrote on Fri, 01 December 2017 13:47
>> emerystora wrote on Fri, 01 December 2017 12:56
>>> The sensing wire from the alternator that controls the internal voltage regulator goes to the engine battery.
>>>
>>> If the 11.8 volts he mentions is the engine battery it could mean that the isolator is indeed bad and the low voltage it is providing to that
>>> battery is causing the voltage regulator in the alternator to increase to 20 volts in an effort to increase the voltage to the engine battery. So,
>>> I still maintain that he has a bad isolator.
>>>
>>> Before looking for other causes I would recommend changing the isolator.
>>>
>>> A quick check could be to move the center wire on the isolator to the top terminal and checking to see if the voltage changes to the
>>> approximately 14 volt level. If it does then it definitely is a bad isolator.
>>>
>>> Emery Stora
>>> 77 Kingsley
>>> Frederick, CO
>>
>>
>> Ok I moved the center wire to the top post (which is the chassis battery) and it is showing 14.5 volts with the
>> engine running so it appears the problem is the isolater and luckily Oreilly has a 70 amp isolater and a 150 amp
>> in stock
>> If i remember from the is the 70 amp adequate?
>
>
>
> Update
>
> Replaced the isolator and now I get bout 14.7 (really cheap meter) hard to tell exactly
> on the center and bout 14.1 on both the top and bottom post.
>
>
> --
> Tom Lins
> Elkton, FL
> 77 GM Rear Twin
>
>
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