Question about 1986 Honda Accord

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Battery light comes on

86 accord battery light comes on at rpm's higher than idle

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Have the alternator tested, this sounds like a diode is failing

Posted on Dec 19, 2008


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My 1991 Honda Accord Lx is having a problem. I put a new fuel pump in it, but when I start it up it will run for a few minutes and then it start to sutter and the battery indicator light comes on and it...

Sounds like a low idle. adjust idle to a higher RPM by tighening the nut and bolt to the throttle body from the gas pedal. It is reccommended that you get it inspected and read the ucu or computer for a code this will tell you the exact problem, but will not tell you to adjust throttle body to up idle.

Nov 08, 2010 | 1991 Honda Accord

1 Answer


If the ignition timing is incorrect and or someone has turned on the idle screw without bypassing the PCM. Otherwise the IAC(idle air control motor) is defective. Possible vacuum leak also.

Feb 13, 2010 | 1986 Honda Accord

1 Answer

Battery comes on and off at higher RPM

The alternator has a regulator built in to it. Alternators create an alternating current that then goes through some diodes that create the DC voltage that the car runs on, and charges the batery.
The diodes, and the regulator are built in to the alternator in nearly every new car. When the car is running at a lower RPM it sounds like they are doing there job just right. At the higher RPM's the alternator makes a higher voltage that must be regulated to about 14 volts for your accessories, and your battery to charge. It sounds to me like the regulator inside the alternator is wearing out. If you take your car to Checker, Kragen, or equivelant, they can do a test on your regulator for FREE.
The Checker by my house will only do this test while the sun is shining outside so you might want to call first.
Take your car in to them and when they are testing it rev the car up so the problem will manifest itself while on the machine.
You will probably have to change out the whole alternator, diode, regulater. (They are a package deal.)
I would get the lifetime warrenty one if you need to replace it. That doesn't mean it wont break down in the future, but it does mean you won't have to pay for a new one ever again for that car.

Aug 22, 2009 | 1986 Honda Accord

2 Answers

98 expedition battery light comes on with increase of rpm

There may be no loss of voltage, but is there a surge of voltage?

As for the battery itself when tested, it should read 12-12.5Volts across the
leads when the car is off. When the car is running, the battery should be reading 13-14Volts across the leads, anything lower means the alternator is not charging your battery, anything higher means the alternator is over charging and damaging your battery.

Another cause for the battery light could be your ECU has detected an error

Aug 20, 2009 | 1998 Ford Expedition

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Slow idle, about 500 rpm, how do i adjust the edle higher

fixed the problem
don't need or want your plan

Jun 04, 2009 | 1999 Honda Accord

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1988 ford festiva

start with a tune up, (air filter ,spark plugs, plug wires ext)..adjust carborater(air fuel mixture could be off)

Jun 02, 2009 | 1991 Honda Accord

1 Answer

'86 honda accord battery light comes on when rpm's are lower than about 2.5

Your altinator may be going bad, If you have a multi meter ground it on the alt. caseing and push the hot lead into the red wire on the back side of the alt. , as the car is running, you should get a reading of 14.2 or better if its less, the alt. is bad. But if its 14.2 or better change the battery.

Feb 26, 2009 | 1986 Honda Accord

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