I installed a tach the other day and now my turn signals and brake lights don't work. The parking lights and the tail lights will come. I was messing around under the dash when I put the tach in so I'm wondering if I might have knocked loose some wires. I checked the fuses and they are all good. Anyone have an idea why they both quit?

 

what did you hook the wire for you light in the tach into also if you took it down look at the fuse box ive seen a few that the wires started coming out the back just a long shot

 

Sometimes my signals won't work and i have to wiggle a fuse in the fuse box and set it just right then it will work (can't rember which one) sometimes I hit the bottom of the fuse box and that'll do it to.

 

I think the brake lights go through the multi function switch so check the wires to that.

 

The brake lights are on a different fuse then the blinkers. I agree its in the steering col. plug area.

 

I know next to nothing about any of the wiring on my truck. Where is this switch at?

 

Turn signal switch=multifunction switch

 

Hazard switch connector is my guess.

 

I'm not sure what it is but the black electrical box behind the glove box. Mine didn't work when I got it, randomly unplugged the box, plugged it back in and they have worked for 4 years now. 1 more thing to check.