Question about Datsun 510

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Alternator is working and have good battery but something is draining battery as car is running Datsun 510 1979 model

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  • Datsun Master
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Bench test the alternator, suspect diode problems, that hinder fill charging capability.

Posted on May 30, 2010

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Posted on Jan 02, 2017

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5 Answers

Can a bad alternator cause a battery to die overnight?


A bad alternator no longer charges the battery, the battery will die once it is drained. This will occur more rapidly when using equipment that runs off of the battery( lights, heater blower, windshield wipers etc.) even electronic ignition will run down a battery. Your battery just went over night the alternator may have stopped working long before. Go to an auto parts store that offers free testing to make sure it is your alternator before making repairs.
Good luck.

Apr 20, 2015 | 2003 Chevrolet TrailBlazer

1 Answer

1981 datsun 720 truck. It does not start but if we push, it does. Battery i and alternator is good. we tested it.


wires disconnected at battery and to starter and solenoid,also check nuetral safety switch on lower inside steering column check wires

Aug 16, 2013 | Datsun 720 Cars & Trucks

1 Answer

I have a 97 galant that keeps blowing the 100 amp fuse? alternator tested good twice checked wiring reads good is there another fuse ?


Usually that fuse powers the alternator and the fuse box.
It would have to be a big short to ground to blow that fuse.
Its possible the main wire to the alternator is touching a metal spot, or the alternator is shorting out inside when it is running.
What is draining the battery may be something else, or the battery could be discharging after the fuse blows if the alternator is not charging it.

Apr 15, 2013 | 1997 Mitsubishi Galant

1 Answer

240z battery drain


Have you confirmed by going out to the car at night that none of the interior lights or lighted visor lights truck or hood lights are staying on? That is by far the most common cause of a battery drain. Other less common cause is a defective alternator rectifier diode Disconnect the battery overnight as well to confirm you don't have a shorted battery cell, that to will run the battery down, it is called an internal drain. Also make sure the top of the battery is clean of any acid.

Feb 09, 2012 | Datsun Cars & Trucks

2 Answers

My car battery keeps getting drained. what is draining my battery.


Are you sure that you have a problem with something draining the battery, or do you have a problem with the alternator not charging the battery? I would have the alternator tested to make sure of that before spending hours and hours troubleshooting electrical problems.

Basically, to check a problem like this you will need a clamp on amp meter. Then you pull fuses from your fuse panel and see where the drain is. Make sure you have a good layout of your fuse panel and fuse sizes (a digital photo is also a good idea) before starting, so you don't introduce problems.

Jun 26, 2011 | 2000 Volkswagen Jetta TDI

2 Answers

My 2000 lincoln ls battery keeps dying have bought 2 new batteris same peoblem is something draining the power?


Either something is draining the power or your alternator is not recharging your battery. Do you have a DC voltmeter? With the engine running check the voltage accross the battery it should be about 14 volts. If it's down around 12.5 volts with engine running the alternator is not working. If you determine the the alternator is working and the battery goes dead, then there is a draw on the system. It could still be the alternator though, there are diodes in the alternator, a diode acts like a one way gate for electricity. With one bad diode the alternator will still work but, when you shut the car off the alternator drains the battery back down. Something is drawing it down, without testing equipment, you'll have to take it to a shop. Something you could try, after the car has been shut off for while, an hour or more, go feel if the alternator is warm or hot, if so it's drawing the battery down. Disconnect the battery overnight so it doesn't go dead on you.

Jan 05, 2010 | 2000 Lincoln LS

2 Answers

Car stops in the middle. It drains out battery after driving 10 miles or so. I got battery charged and test came out good. And I see 15.4volts coming from alternator while engine is running. What could be...


Check the voltage regulator if there's coming out of it.
you may have a good alternator but if nothing goes at
the alternator, then, it results to a drained battery. Just
replace your regulator, if this is not working.

Oct 02, 2009 | 1996 Ford Explorer

3 Answers

Something is draining my battery


you need a mech you have a draw whitch meeans something is on at all times or internal short on something or pass bad batt.
make sure things ore off like dome light trunk light cig lighter out of socket cell phone charger etc. good luck

Aug 30, 2009 | 1997 Chevrolet Cavalier

3 Answers

My batterys dont charge after a long run or short i hasve to recharge them to start the car i have checked them with a batterys tester and they are ok but something is drainning them or not charging them...


Check voltage at battery before you start, then start & check voltage while running. Obviously your battery reading should start climbing to 13.5 - 14.5 VDC when engine running, otherwise alternator is defective, unless that car has an external voltage regulator on it. Make sure your alternator belt is in good shape & tight, and all connections at battery, & alternator are clean & in good shape. To find a battery drain when vehicle is shut off, use a 12vdc test light connected between positive connection & battery post. If the lights on, you have a drain, & start removing fuses to find the culprit, or remove all & start putting them back in until light comes on bright. Now you've isolated the circuit causing the draw. should give you an idea where to look. Remember your radio will have a constant small draw for memory function.

Dec 06, 2008 | 1998 Kia Sephia

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