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clint3240

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"iv got a late 80s merc 5.7L i

"iv got a late 80s merc 5.7L i replaced the alternator and the battery. the engine will run fine but the battery is like dead after i shut the engine off, it will barely crank. i kept trying to crank it and cooked the wire that goes form the alt to the battery. i can jump it and it works fine, but after i shut it off its dead.

the old alternator had these 2 wires in a black plug. the new alternator does not have this option but there is a black rubber thing in place of it that says do not remove. i just put a nut on the wires that went to it.

any ideas?"
 
wired wrong or wrong alternato

wired wrong or wrong alternator. what brand was the old one and the new one?
 
"it is not wired wrong and it

"it is not wired wrong and it is a perfect fit, according to my friend who is a mechanic he says those 2 unknown wires are for the key switch to "wake up" the alternator. i am not sure on the brand.....i used to have 2 batteries in parralell, i changed it to one.... and that i may not have enough starting amps and to try adding another battery...which is not a problem because i can get them for free"
 
There is no way that operating

There is no way that operating the starter should fry the alternator wire.
Something is wired wrong or making poor contact.

Rod
 
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