My wife has an 88 Toyota Corolla (4af, I think) and the brake and battey light came on at the same time. Her car was on and all of a sudden, all the accessories wanted to turn off.
We turned the car off, and it would not start again. I assumed the problem was the alt. since it has never been changed, so I replaced it with a new one. The car has started up fine ever since,.. but the brake and batt. light are still on. The brake res. is full just above the max line.
Should I change the battery??? When I used a voltmeter,.. it read 13v's while off,.. and 14v's while on. I turned the headlights on and the volts dipped and went back up fine.
Is the battery suppose to measure 13 volts while off?? I thought it was suppose to measure 12v's???
Could this be the problem???
Originally posted by homeguard whats it do when you try to start it?
edit: try jumping it first also.
I replaced the alt. and it started fine. It has started fine for the past week and a half. The alt is charging the battery fine also.
The car cranks and starts right up,... but the brake and battery warning lights are still on.
Now her radio wont' start,.. I'm thinking there's a short somewhere but I cant find it. Why would both warning lights come on at the same time???
Any suggestions????
My brake light wouldn't go off. Check your brake fluid level first. My front pads were fine, but I needed new drums in the rear so check it out.
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Originally posted by homeguard you check all the fuses?
Yes.
But one fuse is bad,...it's the one under the hood that says "CDS".
it's one of those big peach colored fuses.
I replaced it,.. but the lightdidn't go off.
Originally posted by SR5 Rolla My brake light wouldn't go off. Check your brake fluid level first. My front pads were fine, but I needed new drums in the rear so check it out.
Brake fluid is topped off.
I have to check the brakes themselves.
The reason I didn't,.. is cause the charging light is on also.
If the break light AND the battery light come on at the same time, chances are its your alternator, I learned that recently from experience. The alternator charges about half the time and the other half it will give low charge, this is why the brake/battery light comes on, it indicates that your alternator is producing a low charge (under 12V) and eventually it will stop charging.
If the brake light alone comes on, that means that your brake fluid is low, not that your brakes are broken or anything like that.. the only sensor is located on the brake fluid bottle and that's it, there's no sensor for worn out pads/shoes(well except for the squealing spring on brake pads) or broken parking brake cables.. you get my drift?
However there is a sensor on the brake lever that turns on when you put your parking brake on, this explains why your brake light gets brighter.
Originally posted by REN69 If the break light AND the battery light come on at the same time, chances are its your alternator, I learned that recently from experience. The alternator charges about half the time and the other half it will give low charge, this is why the brake/battery light comes on, it indicates that your alternator is producing a low charge (under 12V) and eventually it will stop charging.
If the brake light alone comes on, that means that your brake fluid is low, not that your brakes are broken or anything like that.. the only sensor is located on the brake fluid bottle and that's it, there's no sensor for worn out pads/shoes(well except for the squealing spring on brake pads) or broken parking brake cables.. you get my drift?
However there is a sensor on the brake lever that turns on when you put your parking brake on, this explains why your brake light gets brighter.
Well,..thats why I changed the alt. first.
But both warning lights are still on.
The new alt is charging fine. I've checked the battery once a day for the past two weeks and it measures the same volts (13v's).
I checked the battery and it's in good condition.
What else could it be??
I had that problem with my 4af also if you changed the battery and the alternator and the light didn't go away, also check the battery terminals if that still doesn't fix it then it this. its the main power wire on the postive side this same wire controls the choke on the car i think its a yellow wire, that wire is corrode or starting to break down over all the years and weather conditions like mine did so what you need to do is jump the wire from the alternator to the main power wire on the battery that way there two way for the power to get through the system. it took me 6 months to figure out the problem. it costed me 2 battery and alternator, over time is will overcharge the battery and burn the inside of the alternator. this should fix your problem like me know the outcome.
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88 Corolla Brake/Battery Warning Light On???
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