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Old 02-06-2008, 09:44 PM   #1
4bangersti
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Default My Emergency brake battery and rear diff temp light come on at the same time

I need help I dont know what to do just recently my Rear Differential Temp light, battery light and brake light all came on at the same time I dont know what it is?
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Old 02-06-2008, 10:13 PM   #2
Mulder
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Check the alternator belt to see if it's broken or slipping. If it is you won't have PS either.
If the belt is ok the alternator and/or battery may have taken a dump. Put a voltmeter across the battery and note the readings. With the car off a good battery should read 12.5V + or - a couple tenths. Running at idle, with the engine warmed up and no accessories on, should see about 13.5-14.5. If you turn some things on (lights, AC etc) the voltage should dip momentarily and then come back up if the alternator is taking the load properly.
Note that if there are bad diodes in the alternator, it's possible for the voltage to appear ok on a meter but the alternator will not be charging properly and can cause the symptoms you are having.
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Old 08-14-2012, 03:01 AM   #3
sti07guy
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has this happened to anyone else? because it has happened to me. all 3 at the same time. If it has happened to you, what solutions did you take or have to take?
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Old 11-15-2012, 10:01 AM   #4
AliBenn
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this just occured to me!
all 3 lites on.
my volt guage in the car reading 10v with lights on, 11v with lights off(low reading)
performed alternator test===>with veh running, remove neg battery terminal, car dies.
looks like my alt. took a dump

FYI i just bought a battery 4 months ago
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Old 11-15-2012, 04:47 PM   #5
AliBenn
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just slammed in a $125 AM alternator during lunch @ work.......im golden

new alt fixed all 3 lites
im driving home!
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Old 11-15-2012, 05:18 PM   #6
Mulder
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Quote:
Originally Posted by AliBenn View Post
performed alternator test===>with veh running, remove neg battery terminal, car dies.
Never do this. It was only a valid and safe test decades ago on cars with generators and no onboard electronics.
To test an alternator, use only a meter or scope or pull it and take it to a parts store or rebuild shop for testing.
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