Question about 1997 Mazda Protege

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Alternator runs hot when battery is connected

I'm convinced that it would be a short that is creating strain on the alternator, but I cannot find the short, and the battery stays charged over night enough to start in the morning... is there something i'm missing?

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When you start the car you need to see if the alternator charge its supposed to 13,7 to 14.5 max it supposed to stay like that but the way our taking its probably charge ok when its cold and when the car get warm the charging goes down in the back of alternator our supposed to have the same voltage as the battery if not check the big wire in the back for corrosion if our not sure the wondition insted of opening the wire harness bring direct power from the positive side of battery to the big wire in the back of alternator and from the negative side connect to the metal of alternator after that if its still get to hot change the alternator if you think my solution is intelligent please rate it thats the way i would check our caqr in my shop thanks pierre

Posted on Jul 30, 2009

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Posted on Jan 02, 2017

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Having a problem: I have recently replaced the battery and checked my alternator (it checks out good) on my 1996 Subaru legacy 2.5 GT


Run engine without switching any of the items and connect a voltmeter to your battery. It should read more than 13volts. If less than that but reads about 12.5V then check drive belt tension. If it reads OK (above 13V but not exceeding 14.5V) then switch on each item individually to check for biggest voltage drop. The one that creates the biggest drop maybe the one that creates that drain. If drop only happens when ALL items are on. then your alternator may need servicing because it could not cope with large loads. Also check all wires connected to it (alternator).

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Why doesn't new alternator charge battery?


Some cars have a fuse for the alternator instead of link. The belt is on correct and all connections are tight? What's voltage while running? Year model?

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I have a 2002 ford escape just got new battery and I'm still needing boost after boost wat could this be


This could be alternator not putting out correct voltage, could be starter going bad, could be some short creating a drain on the battery, like a light on somewhere, could be a loose or bad ground on the neg battery cable..Could be the wire that sends voltage from the alternator to the pos battery cable which charges the battery.. Take your volt meter test the output voltage of the alternator with the engine running,, should be about 14v.. now check the battery,, the 14v or most of it should be getting to the battery.. if not find the bad connection where the power is being lost.

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Car gages all turn off and than turn back on a few miles later


Do you have an aftermarket stereo system? these cause a tremendous strain on your alternator which may be the problem. Check all connections to alternator, battery, and ground cables. the alternator will provide enough power to run your vehicle if it is working properly. If it is faulty, it will drain your battery. take it to an auto parts store to be tested before purchasing a new one, because it could be as simple as a loose or corroded wire.

Jul 11, 2012 | 2003 Ford Focus

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My car just clicks when i try to start it, what could be wrong?


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

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1 Answer

The alternator getting hot & the bus not start


hi, this is one of these faults that the alternator, is INTERNALLY SHORTED or the POSITIVE FEED FROM STARTER MOTOR to the ALTERNATOR to the car (LARGE CABLE). there is a way to test this. take the battery (NEGATIVE LEAD) (as not to short-out the battery cable) off and TAKE OFF the (BOLTED TERMINAL and the second cable) of the SMALLER ALTERNATOR CABLE replace the LARGER CABLE to the (ALTERNATOR and BOLT this ON to determin if the alternator is shorted OR it is the cable from the ALTERNATOR to the CAR FUSEBOX. ( you may need to read this again, not easy).if when the battery is reconnected to the alternator it cools down ALTERNATOR O. K.(then the LARGE CABLE that SUPPLIES the car is SHORTED).

THIS CABLE CONNECTS FROM THE BACK OF THE ALTERNATOR (BOLTED TERMINAL) AND GO TO THE FUSEBOX

because the battery is connected to the alternator and the alternator is conected to the fusebox. (the battery to alternator is part of the CHARGING CIRCUIT and the alternator regulator is the other part, only when engine running 1500 rev min. gerry

Sep 11, 2010 | Toyota Passenger Cars & Trucks

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Cruise causes surging, vehicle does jerky lurching


Get a good alternator not a cheap one.

Apr 21, 2009 | 1999 Isuzu Rodeo

1 Answer

Battery dead every morning


Something is shorting out (drawing power but not returning it to the battery)
Make sure you don't have any accessories plugged in and running or anything else running or on when you go to bed at night as this would draw down the power!
I'm assuming you have to jump start it every mourning.
Is that correct?
If so the new battery and alternator will be strained and go again soon!
Go to an auto parts store like Advanced Auto Parts and have your battery and alternator tested (they do this for free) and may be able to verify that you have a power draw somewhere!
A jury rig fix would be to put a battery disconnect (available at any auto parts store and pretty easy to install) at the terminal to the battery and disconnecting every night but that won't fix the power draw.
What was the original problem that led you to change the battery and alternator?
jack
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2 Answers

Wont hold charge in expedition


  1. Check the wiring of the new radio installed as follows..
  2. Disconnect battery ground
  3. verify radio ground wire is grounded to metal
  4. verify radio hot wire (normally red and thick) is connected to a power source that is off when the ignition key is in the "off" position.
  5. verify that the always hot wire is connect to a constant 12v power supply even with the ignition off.
  6. make sure the pwr antenna wire if not used is taped at the tip and not touching any metal.
  7. verify that all speaker wires are connect correctly and not shorted to ground.
  8. connect battery ground you may get a small spark if your courtesy lites work.
  9. start engine verify your battery is charging by disconnecting the battery ground cable while the engine is running, it should continue running if it don't, alternator maybe bad.
  10. If it continues running problem solved..

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