1991 Chevy S-10

MATT4401

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1991 CHEVROLET S-10

Electrical problem
1991 Chevy S-10 4 cyl Manual

What do the 2 small wires on the top of the alternator on a 91 chevy s10 with a 2.5L 4cylinder do?

Monday, December 29th, 2008 AT 7:09 PM

4 Replies

JMICHAEL8888

MECHANIC
45 POSTS

If they are black they are ground, other wise I know at least one of them (brown I believe) signals the battery lamp on your dash. Big red of course goes to battery.

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Monday, December 29th, 2008 AT 8:20 PM

MATT4401

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12 POSTS

One is pink with a black stripe and one is brown. I know the big red wire goes to the battery, but I was wondering if the brown and pink have anything to do with charging? Also how do I check if the alternator is charging?

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Monday, December 29th, 2008 AT 8:45 PM

JMICHAEL8888

MECHANIC
45 POSTS

Yeah that brown wire goes to the battery light, the other im not sure but im sure it doesnt have anything to do with charging. If you have a volt meter, check battery for volts, engine off. It should be about 12.5 volts.
With the engine running a good alternator will put out about 14.5 volts (checked at the battery). If you have a lot of accesories turn everything on(heavy load) and note the voltage.

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Monday, December 29th, 2008 AT 8:54 PM

MATT4401