Stock 250 CID / I6 Alternator wiring picture
I can’t get my ‘72 Blazer started (250 CID I6) after removing the alternator (rookie mistake of assuming I’d remember the wiring / not photographing the wiring prior to taking it apart). So, can anyone please send me a picture of the alternator wiring in your stock I6 250 CID engine. Many thanks in advance.
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Re: Stock 250 CID / I6 Alternator wiring picture
There are only 3 connections. The Red lead goes on the positive terminal. This is the biggest one and is more outboard. Some alternators have a stud connection that's red inside, under a rubber ''hood.'' The field connector is a dual-lead plug that snaps in to the socket at 12'o'clock on the back of the case. The Ground stud is more inboard and connected by a smaller Black lead, sometimes there's a metal clamp crimped around the whole bundle with a tab that goes into a slot on the back of the Delcotron casing. It's secured by a smaller nut.
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Re: Stock 250 CID / I6 Alternator wiring picture
I'll get one of my 68 in the morning
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Re: Stock 250 CID / I6 Alternator wiring picture
Thanks Mark. I’m pretty sure I have the wiring correct but it still won’t start. It turns over but doesn’t engage.
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Re: Stock 250 CID / I6 Alternator wiring picture
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Re: Stock 250 CID / I6 Alternator wiring picture
You’re right RustyPile. The alternator was not technically replaced. I changed the belt and removed the alternator due to stripping the threads in the top / bracket position, only to find out from someone much smarter on this very forum, that all I had to do was replace the screw with a longer version and tighten it with a bolt. But by then I had already removed the wire connections to the alternator... All this to say that I’m confident it’s not the alternator. I’ve got a couple of ideas to try out based on what I did. So I appreciate your help and those who are following this thread. I’ll keep you posted with the outcome, but not till later in the week, when I can get back to the Blazer.
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Re: Stock 250 CID / I6 Alternator wiring picture
Probably the Solenoid. Redundant ground straps never hurt either. Battery connections...
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Re: Stock 250 CID / I6 Alternator wiring picture
1 Attachment(s)
Really not much to wire up .
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Re: Stock 250 CID / I6 Alternator wiring picture
Thank you Mark. This is visual confirmation that I got it right. What threw me off was the bracket that ties-in the the bolt which appears to do nothing other than keep the wires tidy.
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Re: Stock 250 CID / I6 Alternator wiring picture
Here in AZ, I don't have the corrosion problem. I file the bracket/keeper/tab clean with a ingnition file. But on my latest alternator, these's a flanged 3/8'' bolt threaded into the case back. I have a ground strap bolted there connecting with a motor mount bolt, that also has a bigger ground strap to the frame. Can't have too many ground straps.
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