Engine brake won't turn off.

Hmmm most have an engine brake fuse. If nothing else, just pull the panel off that your switch is in and unplug the switch. Its probably bad. they wear out. Might even have the fuse connected to the plug in the dash?

 

Sounds like you got too many switches for the same function if I'm understanding you corectly. You're saying you have a single toggle marked high-off-low and you have it in the up position? Is that up position high or low? Have you tried it in the center-off postion. Sounds like somebody has installed an extra switch for some reason. I can't see why you would have three switches, one on-off and one hi-med-low and another low-off-hi. Sounds like an industrious mech doing a quick fix for a part problem or something another. One of them if somebody worked on it first problems. Is it still unlatching the jakes at below 800 to 900 rpm? If not, you definitely got a chonudrum. You're bypassing all ecm functions and going back to the manual set up days.

 

no he said there were two retarder systems available for that truck. said he had the single switch system. Hey slug go back to your fuse panel diagram and see if theres a relay in there that says engine retarder? yea he said he had it in the center(off) position but it wasn't cutting it off. The switch is probably bad. Was trying to locate the engine retarder relay location on the internet but never found it. According to one site I was on it said the truck had all relays instead of fuses and said it had an engine retarder relay but it didn't say where it was located.

 

My bad, I thought he was talking about what he was seeing on his dash, not what he was researching, sorry.

 

pull the wire that goes to the clutch switch. then it will never come on

 

Does the switch actually say high/off/low? I'm curious because we have several with a single switch on the dash that is high/med/low and the 2nd switch is on the shifter for on/off. It has confused many drivers that were not used to it at first.

 

No Problem. I misread it myself the first time.

 

Yea he said he has the single switch system. High on top, off in the middle and low on the bottom.

 

can you give me a part number to that shifter switch
I wanna see about putting one on the shifter for my 18 speed

 

Just mash through the gears at the truck stop and let the jake work it's magic. Everyone will know you mean business and you're a real bad boy.