Pre 84 Trucks 1st gen pickups

20R alternator wiring

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Old 05-01-2006, 05:17 PM
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20R alternator wiring

So it seems I'm down to my last real hurdle of the engine swap.

Appaerently a PO had snipped off the plug for the alternator, and attached three seperate spade connectors on the green, blue, and white wires.

The white wire is obvious, as the wire has a 'memory' that holds it vertical (and there's only one vertical prong), but the green and the blue are both horizontal, and since I'm not the one who took the alternator out, I dont know which one should be on top.

Shop manual is about useless as it only tells me that a green, blue, and white wire go to the alternator ( no chit ) but it doesnt have a photo to ilustrate it.

Is there anyone out there that can pop their hood and look at their wiring to see which wire is on top (green or blue)?

That and the radiator are the only thing keeping me from firing this puppy up!! Help me out here PLEASE!
Old 05-01-2006, 08:24 PM
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Nevermind.... got it figger'd.

My engine is up and running now, but it's dark so I gotta wait till tomorrow to do the shakedown.

With any luck I'll be running that 22r-hybrid to work on Wednesday!
Old 09-08-2007, 03:27 PM
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i have the same question which wires go where?
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