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Re: running light problem
You have a Short somewhere in the Lines. Get a Voltometer from any auto parts Store and Start with the Running lights seeing as U can get to them Easier. The dash lights are on the Same fuse so start with the Easiest First. Message me back!
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fuses blow because of dead shorts or excess current draw
to blow a 15 amp fuse indicates a dead short
by disconnecting the rear lights , the problem is in something else you have replaced
could be a problem in the head light wiring
These lights for the dash are controlled by a rheostat instrument control dimmer switch next to the main light switch for the headlights, it is either turned off (have seen this dozens of times) or it is defective. Below is a picture of the switch assembly I speak of. The thumb wheel next to the knob is the dimmer control.
The tail lights run through the headlight switch, they also run through the combination switch(turn signals) that is a known issue for those trucks try messing with the hazard light switch and see if the start functioning, also if you have a tow package the lights have seconday fuses and relay in the electrical box under the hood
From your description it would appear you have an intermittent short to ground on the dash light power circuit.
It may be as simple as wire insulation being cut on a sharp metal edge, or the supply being shorted by a loose metallic object (such as a nut or washer) in a connected assembly.
Check any external wiring for damage - such as connection to foglights etc.
There is no easy fix here -just persistence.
The headlight switch has a rheostat built into it to dim your dash lights, it may have shorted out. As soon as you turn on the switch this rheostat comes into play and is probably whats blowing the fuse. I think if you replace the headlight switch, it will solve your problems.
check each of the terminals of those bulb you mentioned. wonder if there's a relay associated to this circuit, check for short if this is the case. remove all the light bulbs [of course - the dash may not be necessary (it's a PITA) & let's hope that it's not the culprit]. visually inspect those bulbs & replace if something unusual. put back the relay if it has no short, turn on the switch, let's hope the dash lights up & it won't blow the fuse anymore, otherwise look for uninsulated wire touching the chasssis or ay metal part of the car. you may continue replacin the bulbs.