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1998 ranger brake lights come on with the key on, led swap


WHTrunner

New Member
Joined
Feb 9, 2015
Messages
4
Reaction score
0
Points
1
Location
Abilene, TX
Vehicle Year
1998
Make / Model
Ford
Engine Size
2.5l
Transmission
Automatic
Uncle Gump said:
Well it appears that old Uncle Gump was onto something after all.

Just a heads up... if it catches fire... the damage was already done.

Not sure exactly what is on fuse 13... but a safer way to correct your condition would be to put a blocker diode in the brake light circuit going to whatever module is on fuse 13. Probably zero chance of fire.

I think the top suspect for me would be the aftermarket cruise control module. Most all factory modules go through vigorous bench validation from the supplier and internally for these types of things. After production of modules... and vehicles were built they would be validated again... I know because vehicle validation was part of what I did in engineering for several years.
Click to expand...
Theres multiple systems that draw power from fuse 13. The brake lights draw power from it, and I believe the abs system is on it as well. I think theres some other systems on it as well. My cruise control monitors it for voltage at either end of the brake switch, otherwise, it draws power from another circuit.

I agree on moving this thread. I havent found anyone with a similar issue and I did a lot of searching.
 


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