Question about 1999 Chevrolet S-10 Pickup

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1999 chevy s10 has no power, i replaced alternator and now have no power.Battery is fine.

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Check along the firewall the s10 uses a power wire and it runs along the firewall should a post with wires to it see if you have power there.
let me know if this helps

Posted on May 14, 2010


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My 1999 Chevy S10 4.3L won't start in the cold with a new battery and alternator. This only happens in 10 degrees F or below. What could be the issue?

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There is one Battery terminal on the back of the unit, this should be insulated and have a nut on it. Usualy takes a 12mm wrench. There should be a Red wire with a similar size terminal, with a black boot, to cover the terminal. There should be a Black wire with a larger terminal on it, This wire should be bolted onto one of the rear mounting bolts. This terminal is considerably larger and the alternator mounting bolt should go through this terminal. The third wire is rather small and should have a quick connect terminal that should plug into a socket in the back of the unit. This followiing web site has pictures of the quick connect terminal, and alternator. If you click on one of the alternator, you can see the back of the alternator. The shiny terminal is the battery terminal. Do not over tighten this terminal as you can break this off.

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maybe something shorting out drawing power did u have alt tested before switching out to make sure it was bad- sum auto stores such as auto zone/advanced auto can do a load test on vehicle for free will show if their is an excess draw on elect or if new alt is faulty (does happen) check serpentine belt and pulleys belt may be slipping then check ground strap , starter for draw or some other accessory

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