Question about 1999 Ford F150 Regular Cab

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Charging sytem in my 1999 f-150

My truck abs light came on and i noticed that the volt gauge was low and the service engine light came on. I bought a new Altnator and the same thing but the engine light went out. so i also bought a new battery. Still the same thing, Could this be a regulator or the cables maybe?

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  • gerry bissi May 11, 2010

    if you have @ 14 volts at the battery with the engine running, it is not the charging system. sounds like a bad ground somewhere.



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The abs light indicates there i9s something possibly wrong with the brakes try checking the brake fluid you could have a leak maybe ?? hope this helps regards Jim

Posted on May 14, 2009

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There is a wire that communicates the charging system functionality.
this wire may be broken you will need to get the charging system schematics and find this wire and check that it is good.

Posted on May 14, 2009

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Replace battery cables if they are very old .check alternator wires fuse and fuse link.also check belt.

Posted on May 14, 2009

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Volt gauge

You definitely have a problem with the charging system. As it is, the engine and other electricals are running your battery down. You need to put a voltmeter on the battery with the engine running to verify no charging. When the alternator is working and charging, the voltage will be about 14 volts, or somewhere between 13.5 volts and 14.5 volts. It may not even crank the engine over fast enough to start if your battery voltage is now under 12 volts. Then you would need a boost, but if alternator is not working, what charge you now have in your battery may be quickly depleted and the engine will shut down.
Test the alternator as I stated, or take it off and have it tested at a parts store.

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