my battery light is on just faintly and wondering what it could be.

 

Well it could be a host of problems, first I would do a load check on the Alternator if that checks out do the same thing for the bat. Also is it cold where you live. Let's say below 30 degrees all the time if so the cold could be affecting your batteries charge. Good luck hope that helps some!

 

Or if ya dont have a load tester, see if the alternator is actually putting out the voltage it should be. i think its 14 volts. and if its doing that...then yah....Load test:P

 

If this the Rx7 that you installed the GM CS-130 alternator in, then I would recheck the wiring, if you haven't already. If there's nothing wrong with the wiring, itself, then it might be a good idea to have your battery tested (maybe it isn't charging properly or maybe even overcharging). Is there any discharge coming from the battery, check that too?

 

well with my old alternator my stock 1 i was seeing the same problem the dim battery light go on and also i am getting now a small buzz from the new alternator. so doing a load test i would take the battery out and get it check is that what that means

 

nope its hot here like over 80 degrees

 

yeah just drive your car to a shop and ask em to do a load check on the alt

All it is, is basically a huge ceramic heater that they hook up. Crank it to half the apms rating on the battery, and then hold it for 15 secs, and if it drops below 9.8v in that time, its no good. ( i belive its 9.8 neways)

They basically do the same thing for the alternator, .....i forget the numbers on that though.

 

well its at 12v when the car is not running. 11.8 when trying to turn over

 

Yea somethig is fishy with the alternator... either your alternator is dead or in the process of dying. Or you have a lose connection. Check your battery termanals and clean off the acid, sometimes that's the cause.

But i have my money on the dying alternator.

 

would that mean both alternators r bad. the new 1 and old.

 

How long will it stay at 11.8? Disable your ignition and fuel pump. Crank for a good 30 sec and see how low it goes.

I'd wager on a dying alternator, craptacular battery, or loose/dirty connections. Leaning towards the connections if you've tried multiple alternators.

 

whats weird is that now i am charging the battery and it says 14v with its charging at this sec. when i tested with a voly tester. With this new alternator mod i hear a small buzz coming from the now (gm alternator) and figure out what it is. when hooked up. i followed what they said to hook up but still wonder

 

so 12v when its not running and 11,8 when turning over. thats all right,
Get a test when its running though. just go right on the back of the alt, where the big witre comes outta and cassing. See the voltage there. should be about 13V, and not higher then 15.

Also if ya have a diode checker on your multimeter check them out as well. Check the same way as voltage but just switch the leads and one way you should get a reading and then other no reading...

it looks like there is a voltage reg built into the dash as well.......:S not to sure about that, anyone know anything about that ?