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Old Oct 16, 2005 | 10:21 AM
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From: airdrie alberta
Question dash lights

looking for help wiyh dash light problem. whenever i turn on lights fuse for dash lights blow,even when i disconnect wiring harness from back of cluster,have also changed headlight switch.truck is 79 f-150 2wd sb ext cab,can anyone help?
 
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Old Oct 16, 2005 | 02:34 PM
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You have a dead short somewhere. Check each wire for abrasion and touching metal because somewhere in that harness group, a wire is bare and touches metal.
 
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Old Oct 16, 2005 | 02:53 PM
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The wire you are concerned with is a lightblue/red. You have eliminated the instrument cluster, but there are several other places this wire goes to. One place to look is the radio, especially if an aftermarket radio has been installed, and there could be a wiring error over there.

See if there are any other lightblue/red wires going to illuminate the lettering at the heater controls, and any other lettering you might can find that may have a bulb behind them.
 
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Old Oct 19, 2005 | 02:33 PM
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That circuit only goes to a few places - cluster, headlight/wiper light, heater control light, radio, auto gear selector and ashtray light (optional). Look over the wiring and check bulbs - even a blown bulb can cause a short.

Marty
 
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Old Oct 23, 2005 | 06:15 PM
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From: airdrie alberta
thanks for help,found problem in that prev owner tied blue/red wire in with black ground on stereo,now problem is gone so thanks for info.
 
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