the new battery is testing good and the alt seems good. i jump it off then drive it and the battery seems to charge up, but sitting long periods seems to drain the batt. again. could this be a faulty voltage regulator even though the alt. tests good?? please somebody help...
2006-11-24 10:05:59 · 11 answers · asked by Anonymous in Cars & Transportation ➔ Maintenance & Repairs
You have a high resistance short in the electrical system. My best recommendation in the short term is to disconnect the ground wire when you have the car parked overnight. This should keep the battery from draining. You might have a voltage regulator problem, but I am guessing that the VR is in the alternator on a car that new. But maybe not since it is a Ford. I happen to be a Ford guy myself, and I know they were one of the last car companies to move the VR into the alternator.
Finding this short (or load) on your battery is not easy. The first thing to do is to search the car for anything electrical that may be operating with the engine off and the key removed. Look for lights/LEDs, or anything else that may be running. You may also want to take a good look at any aftermarket stereo equipment if you have any. The chances of this being a problem with the stock electrical system is pretty rare...
Good Luck!
2006-11-24 10:18:00 · answer #1 · answered by Skrappy 2 · 0⤊ 0⤋
Well, it's not unheard of that a new battery can be defective, so rule that out first. Next thing is to make sure the alternator is charging the battery, which can be done with a volt meter. With the engine running, you should be getting around 14 volts if it is. If the battery and charging system check out, then you must have a drain on the system somewhere. Is your glove box or trunk light staying on when closed? Perhaps an after market stereo amp that stays on when the key is off? Find and eliminate the drain on the system, and you will be okay.
One way to check it to take off the positive battery cable and clip a test light between the cable and the battery. Does it light? Something is drawing if it does. Pull fuses one at a time until the light goes off. That is where the problem is, look for a legend on the cover of the fuse box that will tell you what that fuse controls, and find whatever is drawing the battery down.
2006-11-24 10:18:00 · answer #2 · answered by oklatom 7 · 0⤊ 0⤋
You have a short or a current draw somewhere.
It could be a bad diode in your alternator as well. Even though the alternator tests good for output, it could still have a short in it which could be the cause of the drain while the car is sitting. I would start looking ath extra equipment like car stereos and alarms. Then I would check each circuit of the car to see if there is current draining when it shouldn't be (lke whn the ignition is off).
2006-11-24 10:12:25 · answer #3 · answered by konstipashen 5 · 0⤊ 0⤋
If you jumped the old battery, or the new one for that matter, you may have blown out the diodes in the alternator, you may have a short someplace, you could have the dome light on without knowing it, numerous things to check, but something is draining the battery.
2006-11-24 10:11:01 · answer #4 · answered by Anonymous · 0⤊ 0⤋
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2016-05-22 23:05:51 · answer #5 · answered by ? 4 · 0⤊ 0⤋
usually draining after two days is a current draw and requires someone knowledgeable to diagnose...
But usually check for door lights staying on, trunk,hood,or glove box lights staying on... But I've had some issues with factory radios and factory amplifiers causing a draw sometimes that will bring the battery down after just a day or two..
So check for lights staying on and unplug the amplifiers (even aftermarket) and radio and recheck... if unsure, call in the pros sorry
2006-11-24 13:54:30 · answer #6 · answered by gearbox 7 · 0⤊ 0⤋
It sounds like it could be the voltage regulator.On a 91 it is probably built in to the alternator.
2006-11-24 13:40:38 · answer #7 · answered by Suzanne M 2 · 0⤊ 0⤋
you say the altenator "seems" good. Does that meen you think it is good or you had it tested. If you had it tested then I would make sure you didnt get a bad battery first then if not I would check all the wires and make sure grounds are good.
2006-11-24 11:57:28 · answer #8 · answered by rwings8215 5 · 0⤊ 0⤋
IF it's not the v.r. or the alt. check your batt.cables,after 15 years of wires rubbing on metal,can be a nightmare.
2006-11-24 10:28:12 · answer #9 · answered by kman1830 5 · 0⤊ 0⤋
either it isnt charging, so like a bad altinator or voltage regulator...or you have something draining your battery while your not driving it...like headlights
2006-11-24 10:10:56 · answer #10 · answered by FJ40spencer 3 · 0⤊ 0⤋