Question about 1994 Ford Ranger Supercab

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Washed engine alternator gauge jumping and stopped putting out voltage to battery

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Lesson learned the hard way...don't wash your engine...likely you blew the diodes in the alternator. They heat up while running and shatter if hit with water. Or, if yoou are lucky you have a poor connection somewhere and when wet it disconnected...but I doubt it.

Posted on Jul 18, 2009

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2 Answers

My car needing a jump threw out the day


Ok I would have the battery tested. While testing battery make sure all connections are clean and tight on the battery terminals. If battery checks out to be good. Test the charging system, alternator. If alternator tests good make sure you belts are not slipping or worn and stretched out as this could cause a an inconsistent charge. While doing the battery test if posible do a draw test to see if anything is during current all the time as this could be draining or weakening the battery.

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It could be a faulty alternator. This would cause a battery drain since the alternator would not be recharging the battery and supplying operating voltage to the vehicle. Once the battery dropped to about 8 volts then the gauges, A/C, radio and other electronics would start acting crazy. Eventually the car would have shut down, but since you stopped at the post office, that didn't happen. With the battery being so low in charge, that would not allow the car to restart, as there would not be enough current to engage the starter properly. Check the battery voltage. If it seems ok (12-13 volts), try checking it again with someone trying to start the car. A normal battery will see some voltage drop, but a drained one will fall to almost zero with a starter load. Since you have gauges and not warning lights, a discharging battery may have gone unnoticed. If you determine the alternator is bad, be sure to have the battery charged, or if necessary, replaced before using the new alternator. A low battery can cause a new alternator to fail and most alternator warranties will not cover this type of failure.

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1 Answer

1998 Toyota t100 shuts off when I take it off park, also very weird it shuts offs when I put the windows up. I just put a used engine after blowing the old one and it has new alternator from discount


The sticks? Some kind of voltage gauge?
Test the alternator with a voltmeter, make sure its output is good. If using the windows kills the engine, I think the alternator is weak or you maybe have a short in the power windows. But shuts off coming out of park, too? Does it not move, then?

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SOUND LIKE DEAD BATTERY.HAVE BATTERY CHECKED AND REPLACED.MAKE SURE ALTERNATOR CHARGING BATTERY.WITH ENGINE IDLING BATTERY VOLTAGE OUTPUT AT BATTERY SHOULD BE 13.5 - 14.5 VOLTS. IF NOT CHECK ALTERNATOR BATTERY FEED WIRE AND VOLTAGE REGULATOR WIRES FOR DAMAGE OR LOOSE CONNECTIONS,CHECK ALTERNATOR FUSE AND MAKE SURE ALTERNATOR DRIVE BELT NOT LOOSE SLIPPING OR BROKEN.

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Well first of all my battery isnt good. Everytime I try to start my car, my gas hand and tempeture hand be jumping up and down. Today my car wouldnt start and i kept tryna get it to start and my gas han...


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there may be a short on the battery (most likely) yet you can get it checked for free at any local (national chain) auto parts store they will check both at no charge to you and offer replacements remanufactured alternators usually they have in stock.

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If you havent replaced the battery I would start there. If the battery has a dead cell in it then it will effectively remove the charge that your alternator is putting out causing your vehicle to stop running because it has no power. I would jump start the car without the battery hook up and remove the cables and see if it runs that way. If it does you have a bad battery.

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2 Answers

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sounds like a shorted field in the alternator

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1 Answer

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With Ign. off what is your batt.voltage reading than take neg. cable off and take another reading 5 min. later. It sounds like a intermitten short, try to isolate voltage drop when acting up. Gauge circuit would be a good start. Schematic would be helpful.

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