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Hi folks. 1990 Ford Taurus. Have had the alternator replaced twice. It is delivering too much voltage and cooking the battery. Shop claimed it was not the voltage regulator. They have suggested a problem in the wiring. Before I spend too much money on that, any ideas? Thanks, Bob S

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On a 1997 Ford Taurus the car battery was installed backwards and now the car will only drive on battery no power pulled from alternator...replaced alternator twice but problem must be something else. Any...


Since you have replaced the alternator and I am assuming that the car still drives. This is a 175amp main fuse that should be OK. There is a 30amp fuse located in the engine compartment fuse box. These fuses are usually green. I believe it is going to be fuse number 25.. but just guessing on your car model. Glance and this and hope it helps..

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Got a 1990 ford taurus and new battery and new alternator but still has 3 amps of draw .what controls the alternator? the wire to it ...


Unfortunately if it was a rebuilt alternator it may have one bad diode causing it to bleed amps and drain the battery. With rebuilds this happens a lot these days. Either have the diodes tested or demand a different alternator under warranty.

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New battery car would not start,change regulator changed alternator, returned battery for new one still the car will not start 1990 ford taurus v6


does it crank?? if not possible starter malfunction.
if it does crank but doesn`t start then it is ignition problem and you will have to tow vehicle to repair shop.

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My 1990 Ford Taurus has a battery drain problem. I'm not sure what is draining it but I just bought a new alt. and new battery and the next day the new battery was dead and I had to jump it. Could it be...


I fixed the same problem in my 1990 Ford Taurus, it turned out to be the external voltage regulator.
I determine that my external voltage regulator had failed by testing the charging voltage across the battery while the car was idling. It should be a maximum of 15V for most batteries; mine was at 17.8V which means the voltage regulator was not regulating the voltage sent to the battery. Also when the car was parked it pulled a constant 3.0 amps (which drained my battery overnight). I was able to test for the amperage draw by just disconnecting the voltage regulator and hooking up my multimeter in series with the battery, the draw was gone.
I replaced the voltage regulator, which is a very easy fix, and I was good to go again. :)
Hope this helps someone too.

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Cost to replace a freeze plug in 1990 Ford Taurus


Do it yourself, 15 minutes and about 5 bucks.
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look for a fusable link (fusible wire) between the alternator and battery .. check grounding strap from engine to chassis/battery neg

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1990 ford taurus won't turn over 3.0l engine auto


first check all fuses, even the high amp fuses under hood. if you replaced the batt. cable and all that check the wiring in the steering column and the wiring to the fuses under the dash. mice get in there and really make a mess!! it could b the key switch too

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1990 Honda Civic dx intermittant alternator failure


along with the relay issue they some models have a very tight route for wiring from the battery to the main harness components check very carefully for any tight spots the wires may be severed also check the frame ground from the - battery terminal wire and connection itself. last suggestion do you get lights and accesories when this happens or is everything dead if you do it could be a bad connection to the starter and have nothing to do with the alternator or battery

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