Question about 1989 Honda Prelude

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Charge problems the car will not charge enough. it holds 12.5 volts at idle. drops below 12 when any thing is cut on ie. headlights, fans. new battery. i have put 3 different alt. they all check fine. why will this car not work?

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  • Honda Master
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Appeats voltage regulator ha a plroem, but, check battery wwater level before replacin battery or alternater.

Posted on May 27, 2009

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Why does the voltage drop to battry volts when i put the gear lever in drive?


the voltage should remain at 14.5 volts at all engine speeds above idle 13.9 volts at idle indicates that the alternator is charging but not at set voltage
head lights are the biggest drain that affects charge rate rate and it it maintains and from you description that is not a problem
when you select a gear it indicates a heavy drain which is a high resistance or a dead short in that circuit that is taking out more power than the alternator is charging
There there is nothing in the gear selection that draws such power
the other thing is that when selection a gear the engine rpm is tool low and the alternator stops charging
for auto vehicles , the idle rpm should be at 800-900 rpm dropping to 750-800 in drive

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2012 chrysler 200 electrical new battery new alt. Will not hold charge.


Since the alternator and the battery are both new, there should be no reason the battery is not charging while the vehicle is running. Check the B+ or Output of the alternator. You might offend your mechanic by suggesting this, but it is your vehicle, and electrical things usually equal expensive diagnosis. You can kinda see and feel this area from above, but you really need to be underneath. This is the bolt looking thing on the end opposite to the pulley. This bolt is longer than the area the nut sits AND the nut might be a touch loose. The wires that go on that should have an eye-like end that slides over that bolt and will seat on that location. If this connection was not tightened correctly the alternator can not charge the battery. Make sure there is a flat locking washer and a nut on the end of that bolt. Tighten the nut, but don't go crazy. Firm. Then snap on the insulator cap that is attached to that wiring. Push it until both sides snap. If the insulator is not on correctly, it will come loose. The B+ is a pretty warm place and without that insulator it can melt nearby wiring. Makes a bigger mess if it is overlooked.

Jul 07, 2017 | Chrysler Cars & Trucks

1 Answer

Charging problems


Alternator , brushes or the regulator are going bad !

Sep 06, 2016 | Cars & Trucks

1 Answer

Alternator is new.battery is new. GMC Yukon is not charging. What could the problem be.


Not sure but I believe the GMC Yukon has an in line fuse in the charging line. If so the output of the alternator will not get to the battery. One way to check is to measure the voltage, when the engine is running. At above idle it should be over 13 volts. Then measure the battery voltage, it should be almost the same within 200 to 400 mVolts. If not the charging line is open. Also if the alternator charging terminal is the same as the battery (12 to 12.7V) while the engine is running, that again indicates the alternator internal regulator is bad. If you turn on the headlights with the engine running above idle and the alternator output drops over a volt or so, the alternator is bad. This measurement can be taken at the battery plus terminal or the alternator charging output.

Feb 10, 2015 | GMC Cars & Trucks

1 Answer

Oil pressure and battery gauge when idle lowers


That may be normal. The battery gauge would drop since the alternator is not charging as much at idle as when you are driving. It should stay above 12 volts as long as the heater or headlights are off.
Same thing with the oil pressure. It should stay above 35psi at idle.

Jan 16, 2014 | 2005 Chevrolet Blazer LS

2 Answers

Battery wont charge, battery/ABS/SRS/BRAKE lights come on while driving and flicker. voltage increases to dash lights/fan speed/headlights periodically.


Get a volt meter, start your car and see how many volts your car is producing while running. Should be around 14 volts. May want to watch the meter for a while since your electric seems to fluctuate. Most voltage regulators are internal of your alternator. If you are getting a lot more or less than 14 volts while running, replace the alternator. If it is not charging, voltage will drop as vehicle runs, until battery is dead.

Dec 12, 2013 | Cars & Trucks

1 Answer

I have a 99 solara se. I have new battery and alternator but the car can't carry a load. Ac lights heater radio so forth


Not sure I follow your problem.
The alternator puts out 13-14 volts at idle but very few amps. If you turn on the headlights at idle the voltage may drop to 12 until you raise engine speed. The amperage goes up with engine speed.
Is the battery voltage at least 14 when the engine speed is 1500RPM or more ?

Jan 08, 2013 | 1999 Toyota Camry Solara

1 Answer

93 nissan pathfinder charging problems


check for voltage at the battery with the engine running. You should see 14 plus volts. Now turn on the lights, bower motor, and whatever else you can to put the maximum draw on the battery. If the voltage drops below 13 volts the alternator is bad.

Feb 03, 2012 | 1993 Nissan Pathfinder

1 Answer

Battery went dead cahnged battery and have power but engine willnot turn over


be sure battery is charged check gauge on dash if it drops below 12 volts when you attempt to crank the car charge new battery also another quick test is turn on headlights if they go off when you hit the key battery is dead

Feb 18, 2010 | 2001 Pontiac Aztek

1 Answer

I have a 1998 Nissan Frontier and I believe there is an electrical problem but I don't know where to look. i noticed that my ''Brake'' and ''Battery'' light was coming on and off and when it did my...


With a volt meter and the engine at idle, check the voltage at the battery.It should always be just over 12 up to 14 volts. At idle with no accessorys on (lights, fan, radio ect.) The voltage should stay just over 12 volts. As you turn on all the accessorys the voltage should rise up to between 12-14 volts.
Also, a new battery needs to be fully charge before use. Most new batterys sit on the shelf and lose charge. My last new battery needed 8 hours of chargeing to be fully charged.
I hope this helps.

Sep 03, 2009 | 1998 Nissan Frontier

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