Need alternator wiring for 1985 454

Mikerizer

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Jackson MS
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#1
Make
Holiday Rambler with Chevy 454
Model
1985
Year
1985
Miles
99999
Engine
454
I have a friend who has to make a sudden trip on Sunday, in a 1985 Holiday Rambler Aluma-Lite HRG with a 454 in it. With the engine running, volt meter sitting on 11VDC; it sits on 12VDC not running.

He's going to take the alternator to have it bench tested. However, the first thing he did was replace the harness that plugs into the alternator; it had burnt up when he parked it 2 years ago. He has three wires on the plug. One wire is a little thicker than the others; probably 12ga, and goes down to the lug on the bottom of the alternator. It has a piece of tape marked "red" on it. Another wire, marked "black" is spliced into a wire going into the wiring harness. The third wire is not connected to anything.

NEED SOME HELP: what is the correct wiring for this? Should the disconnected wire go to ground? Would this model have an external voltage regulator that needs to be connected?

Thanks,

Mike
 

billr

wrench
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#2
You better post some pictures of the alt; show the rear of it, show the terminals on it, show the letters cast into the aluminum housing near the terminals
 

billr

wrench
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#6
Want a guess?

F => 12V, switched power from ignition switch

L => 12V, switched form ignition, but feeding through the dash warning light/gauge in series

S => "no connection"

That's what is shown for a '91 Saturn. From the size and color of the wire at S, I'm wondering if that isn't the battery connection, in lieu of connecting to the stud labelled "bat"