Strange electrical issue involving my LH rear turn/brake light on my 1998 Ford E350 cutaway chassis motorhome. Even looking at my wiring diagram I can't tell how it could be happening. It is straight forward*"old school" system, no "magic boxes". Any help on understanding this will be appreciated!
Below is a condition and result breakdown to simplify the problem:
*1) Brake pedal depressed - Both rear brake lights 'on'
*2) Brake pedal depressed & LH Turn selected - LH rear nothing; RH rear brake 'on'* (steady as should be)
*3) Brake pedal depressed & RH turn selected - LH rear nothing; RH rear turn flashing
Note: The front signals and I/P indicators always work as should*
*4) Brake pedal released - LH turn selected - LH rear nothing; Front and I/P indicator flash
*5) Brake released - RH turn selected - Rear, Front, and Indicator all flash
*6) 4way selected - no lights at all
*Now the really strange part: I removed the trailer LH turn (as per owner manual) #6 fuse (which is good) <#26 on the wiring dig> and reinstalled it. All turn lights work as should and the 4way*operation is normal.
If I step on the brake pedal all goes back to condition 1-6!!! Reset fuse and again all is norm until the brake is applied.*
