electricly stumped

[lonnie]

Have A 99sterling straight truck no turns no hazards but when brake is applied hazards work have new signal switch new flasher and new fuses can any body help please

 

[Martin]

Hi Lonnie,
Poor Ground? Maybe?

 

[Steve Frazier]

I wonder if there could be a loose connection? Could the brake pedal be moving the harness enough to make a loose wire make contact?

 

[jumbo]

I had a 2000 KW W900, with similar problems. It was all under the hood in the fenders. Bad grounds, bad connections. Over the years, the calcium chloride they spray on the roads along with the salt had rotted out just about every conductor. Inside the insulation! no breaks in the conductor, just oxidized copper turned to dust. I took a weekend, pulled out all the wire from headlights, turn signals and every other light in both fenders and just replaced all of it. I did not use KW harnesses, just two and three conductor automotive cable that was jacketed along with heat shrink butt splices. It was not too expensive, it cured everything and I quit messing with lighting issues every weekend. I should have done it sooner. Dumb on me!