97 limited electrical problems

[LimitedV8]

Hello chics and dudes i m new to this site and any help would be greatly appreciated.First off my low beams dont work fuses are good bulbs are good.High beams work and daytime running lights work thats my first problem.Second fog lights do not work bulbs,fuses are good.Third brake lights do not work the only one working is the centre eye beam one on top off hatch parking lights work bulbs appear to be good and fuses are good too.My truck does come equiped with trailer towing package when plugging into a trailer all the trailer lights work and flashers but no brake lights.And last when putting truck into drive the power door locks would automatically lock all doors that where unlocked they do not work anymore.l noticed when it locked my brake lights would work to there must be a connection to this.All of this did not happen at the same time fog lights where the first to go then lowbeams then brakelights and autolocks.Maybe theres a bad ground somewhere???Im hoping someone can tell me of the problems truck has 135000kilometres on it. :fire:

 

[TPLYNCH]

For headlights, if you have the Overhead Console/Message Center, there is a "lamp out warning"? relay in there that if it goes bad, people have had HL problems.

For brake lights/no autolock - Try replacing the brake switch. It is under the dash connected to the brake pedal assembly I believe. Do you have Cruise (speed) Control? If yes, does it work? If you have it on and hit the brakes, does it shut off?? If not, that is another indicator of a possible bad brake switch.

Search for the above items using the search button above, and you should find more info about them.