Re: 89 cutlass has a power drain somewhere how do I find...
The first place to look is the battery cables themselves, make sure that the positive cable has not rubbed off part of the insulation and grounded itself to the frame, if that happens, the area will become corroded, and leak charge to ground, the natural destination for electricity. This is about 80% likely to be your problem, with the key in the off position, very few things maintain a power feed to be able to drain your batt, unless it is something aftermarket, such as some boom in your trunk, an amp will do that every time. Take the constantly powered fuses out, replace the expendable ones one at a time until you find the gremlin, keeping in mind if you completely drain your battery a few times, it is no more good, feel me?
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Could be a fusible link. Depending on the circumstances for a low battery there is a "battery drain sensor somewhere" that is made as a "power saver". It is suppose to keep the battery from being drained and disconnects the culprit automatically. It has been known to even kill the charging system at highway speeds. The driver does not notice the gauge showing discharge and drives until there is not enough juice to run the car.
somewhere in your wiring loom you have a short that is draining power from the battery when the car is not being used, have you checked the battery voltage when the car is not in use?, it should be just over 12v & when the car is running it should be over 14v, if it is still at just over 12v then the alternator or a wire that leads from the alternator to the battery is at fault
Providing there is no trunk light, or glove box light or anything else that is staying on, the biggest culpret for draining batteries is the starter. Try replacing it with one from an auto wrecker, just in case it isn't the problem. Make sure there are no power cables or wires burnt or cracked somewhere that are draining the battery.
You probably have a battery drain from a defect. circuit. Just put a
test light between the ground of the battery and the ground cable. If
you have a drain problem, the light will go on. Then you remove the
fuses one by one until the light goes out to isolate the circuit. A
electrical wiring diagram will be appreciated.
I would say it is the installers fault and that the alternator is
probably working fine, but the alternator is either hooked up wrong or
has a broke wiring harness or the belt is under driven or this is the
wrong alternator for your vehicle. or the best answer is you have a
short somewhere causing the charge from the alternator to not reach the
battery. In other words the pathway is broken. There can only be a few
answers to this question. Something is broken/loose(wiring) /installed
wrong/or the wrong part. Try the z net from autozone. It will give step
by step instructions. You need to include further information of the
vehicle(year/make/model/size engine/ if you want specific informationPull the pos strap off of the battery when the car is running, if it
dies and you know that the alternator is good you could have a short.
That could be what is killing your batteries.
Is your car
killing batteries overnight? Could have a short somewhere else and that
short just put more strain on your alternator.one way to see is to start car with nothing on in the car
an remove hot lead from battery car should stay running if it do turn
head lights on car should die Resistance in the wiring due to corrosion or poor ground. Sometimes
theres a regulator that controls the voltage and amps within the
alternator that is defective
have you checked the glove box light? another way to tell where your short may be is to hook a voltage meter to the battery and notice a drain on the battery with the key off! then start pulling fuses to see when the drain stops and that will narrow down the possibilities of the problem... the drain should be easily located if its killing the battery overnight... help this helps