No Brake Lights

[Broncdiesel]

My fuse for the brake lights blows instantly. I have looked and looked for a short to ground with no luck. I dissconnected the wires going to the tail lights and it still blows. So it seems to be under the dash or hood. Are there any problem areas I should look at? Thanks

[peobryant]

Information on truck? Year, model?

[Broncdiesel]

Truck is a 1990 D250 5 spd (cummins)

[cougar]

Pull the connector that comes off the steering wheel. That will isolate the wiring from the fuse to just before the blinker switch.

[gear jammer 91"]

If your truck is wired for trailer lights I would start there. I've had this problem on two trucks, and in both cases the short was in the trailer light wiring.