Question about 1991 Chevrolet Cavalier

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While driving 1991 chevy cavalier gauges went wacko started cutting out lost charge in battery and died.Checked battery and alternator and both are fine.What should i check next?

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Almost every time a car is towed into my shop with this same story, it is being caused by bad battery connections. ALL of your battery cable connections need to be CLEAN and TIGHT. Check BOTH ends of your battery cables. First, disconnect the battery and make sure the terminals that connect to the battery itself are clean and free of corrosion. Then follow the cables down to where they connect on the other end. On your vehicle, the ground (NEGATIVE) battery splits and has two grounding points. The first is ground #G-110. It is located on the lower left front of the engine near the starter motor. The second is ground #G-100. It is located on the left front fender behind the battery. The POSITIVE battery cable also splits as it goes through two fusible links. These fusible links both supply power to the alternator. It is possible that one of these fusible links is burned. To check them is pretty simple. You can use a test light connected on one end to the NEGATIVE battery connection and use the other end to probe the "BAT" and the "S" terminals at the alternator. These are both large red wires. They should have battery power at all times. If you have power on both of these wires, your fusible links are not burned. If there is no power on either of these, I would recommend having your vehicle checked by a qualified technician so the reason that the link burned can be found without causing any further damage to your car.
One of the wires coming from the fusible links also splits off and goes over to the enging compartment fuse block It is not likely that you will find a problem here, but it is possible that there may be a loose or corroded connection.
Finally, the "F" terminal on your alternator (BROWN/WHITE wire) should have battery power when the ignition switch is in the RUN position. It is powered by the HTR-AC fuse in the fuse block behind the left side of the instrument panel. If this fuse is blown, you may have a shorted blower motor for the heater/AC or you may have a shorted A/C clutch. This will cause the alternator to not charge the battery.

Please also review these articles:
Where Is The Fuse?

My Car Won't Turn Over

What Else Could Be Wrong?

Posted on May 28, 2011

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  • Chevrolet Master
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Check all ground connectios first, make sure they are clean and tight, then check positive connections, use an ohm meter if possible. MAKE SURE YOU DIS-CONNECT THE BATTERY WHEN USING AN OHM METER.. Thanks Ray

Posted on May 28, 2011

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