Having problems with your 1990 Ford F150 ?

My reverse lights want work.disconnect ground from battery and hooked test light clamp to negitave battery cable and tuched prong of test light to negitave battery post. while ignition swich is off the test light is off, when egnition swith is on test light is on. while ignition switch is on pulled every fuse one at a time and test light stayed on. battery is 3 weeks old. keep blowing 25 amp fuse. no power at tail light where harness connects to blub.

Posted / edited by AnonymousUser on : 25-06-2018

Answers :

When testing for a draw on the battery. If the key is in the off posistion and the doors are shut etc. The test light should be off. When the key is on the ignition system creates a draw and the light will come on. So if the test light is on when everything is
\015\012turned off, then there is a draw. Fords of that era had
\015\012issues with the headlight switch heating up,but you
\015\012would also loose the headlights.To pop a 25amp fuse
\015\012I think there is a dead short(bare wire to metel)check
\015\012brown wire(taillight)and the orange+lt blue wire(dir/stop) for shorts accross the rear bumper and at
\015\012the plate lights. Then trace back to the cab. You could use a test light and trace the power back from
\015\012the cab, but you would go through a bag of fuses.
\015\012Hope this helps.
Repair Help & Product Troubleshooting for 1990 Ford F150

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