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Re: [GMCnet] Isolater vs Alternator [message #326652 is a reply to message #326647] Sat, 02 December 2017 13:39 Go to previous messageGo to previous message
Emery Stora is currently offline  Emery Stora   United States
Messages: 959
Registered: January 2011
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The sense wire to the alternator does not connect to the isolator. It goes to the engine battery through the wiring harness. If the isolator failed it shouldn’t drop the sense circuit. When your isolator failed it didn’t allow the alternator to direct the right voltage to the engine battery which caused the sense wire to the alternator to increase the voltage from the voltage regulator.

When you moved the alternator output direct to the battery it then gave proper voltage to the battery and the sense wire that told the alternator voltage regulator to drop the voltage to the normal amount.

The alternator wire you moved doesn’t include the sense wire — just the alternator charging output.

Emery Stora
77 Kingsley
Frederick, CO



> On Dec 2, 2017, at 11:20 AM, Ernest Dankert wrote:
>
> The isolater failed; dropping the sense circuit. The alternator ran away, leaving the dash blower as the only load on high. When I stopped I moved
> the alternator output direct to battery on the isolater giving the alternator load and sense.
> --
> 1977 Eleganza II
> Ogden NY
>
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