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9/19/2017 7:27:10 PM
Posted: 3/15/2006 6:12:18 PM EDT
I have a 1999 Ford F-150 pickup with the 5.4L Triton engine. The dahsboard "battery" light came on and won't go off while the pickup is running, but the alternator meter in the instrument panel shows a regular charge and the truck seems to be running fine with the battery idiot light on.

Does this mean the battery is dying but the alternator is still running the engine? No hard starts so far.
Link Posted: 3/15/2006 6:13:27 PM EDT
Means you need to buy a Chevy truck.
Link Posted: 3/15/2006 6:13:48 PM EDT
You could have a bad diode in the ALT. It would either undercharge or overcharge.
Link Posted: 3/15/2006 6:14:51 PM EDT
Link Posted: 3/15/2006 6:14:52 PM EDT
[Last Edit: 3/15/2006 6:17:04 PM EDT by quijanos]
Fords are famous for "dummy" lights just deciding to come on.


Give it a few thumps or if you can reach it.........kick it.


eta

Try taking off the Positive side of the battery while it is running.
If it keeps running its a Ford. If it dies its a Ford.
Link Posted: 3/15/2006 6:19:17 PM EDT
You probably have a bad diode in the alternator.
Link Posted: 3/15/2006 6:21:14 PM EDT

Originally Posted By quijanos:
If it keeps running its a Ford. If it dies its a Ford.



Bad idea on newer (and old) vehicles... You ever seen a resulting voltage arc from doing this? Let alone what happens to the person holding the cable when this is done and the voltage arc is made?

Put a multimeter on the battery and don't trust the voltmeter in the cluster... That dummy light goes on when voltage drops below a certain point in the system.
Link Posted: 3/15/2006 6:22:02 PM EDT
There may be a problem.. The voltage gauge on the dash is about as accurate as pissing on a electric fence and trying to guess the voltage...

Go to a good shop that sells good battries.. They usually will run a test on you charging system and batt. for free.....

Then buy a Chevy
Link Posted: 3/15/2006 6:24:51 PM EDT

Originally Posted By KG4ZRC:

Originally Posted By quijanos:
If it keeps running its a Ford. If it dies its a Ford.



Bad idea on newer (and old) vehicles... You ever seen a resulting voltage arc from doing this? Let alone what happens to the person holding the cable when this is done and the voltage arc is made?

Put a multimeter on the battery and don't trust the voltmeter in the cluster... That dummy light goes on when voltage drops below a certain point in the system.



I'm shitting around, man.....just hacking on Ford owners
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