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I have a 1991 Ford F-150 xlt ext. Cab. My question is I just changed out the battery and the alternator both brand new and had them tested but the battery is not charging only draining and the alternator is hot to the touch. Should I replace the wiring, fuses, or is it a parasitic drain?

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1 Answer

You need wiring diagrams before you can
do any of what you mentioned.
No one can tell you what the problem is
without the patient to test.

Posted on Jul 09, 2013

  • Jaime San Miguel Jul 09, 2013

    Well I have diagrams for it but I'd don't know what's causing the drain besides a possible parasitic drain or old wiring everything else works but the battery just keeps draining.

  • Anonymous Jul 09, 2013

    Is the battery not over 4 years old & capable of holding a charge. If you have done parasitic drain test in Milli-Amp range you have a good idea of the draw. Only have the computer & radio clock,about 20 mili-amp draw. Google what makes alternator hot,that is the key. Bad battery or resistance somewhere in the charging circuit Try a battery from another vehicle for a couple days

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SOURCE: Draining Battery on 1996 Ford Contour

you will need to do a test with a battery light disconnect the negative wire on the battery and connect one end of the test light to the battery and the other to the terminal with everything switched off if the test light is lit you have a draw if it is not lit then it is something else sometimes door switches and glove box switches wear out and need added lift to properly shut the open circuit down

Posted on Aug 26, 2009

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SOURCE: 1998 F-150 xlt triton v8 has new

make sure all the wires were connected back to the battery there is a red wire that sits by itself and when you disconnect the battery it tends to fall also check the alternator circuit breaker could be blown.

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SOURCE: 2003 Ford Focus battery light is on, but alternator appears good

Disconnect battery ground for 30 seconds & reconnect. Light should be out unless you have deeper diagnostic problem. Charging system good Battery good. This action should reset trouble light. Good luck!

Posted on Dec 29, 2009

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SOURCE: 1991 ford festiva replaced alternator new

it is part of the alternator actually on a lucas unit, a small black box bolted to the rear of the alternator.

You may have a faulty ignition switch or a corroded engine earth cable causing the alternator not to reach charging voltage.

Posted on Jan 13, 2010

  • 167 Answers

SOURCE: My 03 Silverado has parasitic battery drain. VOM

Disconnect the auxiliary power cable from the under-hood distribution center that runs to the anti-lock brake controller. Remove the ignition relay from this distribution center (this will isolate/eliminate/indicate the problem as the ignition switch). Unplug any GPS add-on device, and any radar detector, stereo amplifier add-on, I-pod, trailer brake controller add-on, anything that did not come on the truck from the factory. These can be frustrating.

Posted on Feb 13, 2010

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