1987 Omc alternator

Nmicnh

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May 11, 2012
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I have a 1987 bayliner with omc 3.0 it had a 51amp prestolight alternator in it that stopped working.

My friend gave me a delco 68 amp alternator.

I looked up part numbers and they match but the delco has a red and black wire off the back and the prestolight did not have wires it has a red/purple and purple wires that plug on to terminals on the back.

If anyone can tell me if you can use it or do I need a new alternator? Or which wires do I hook together if it will work.
 
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