1999 cummins 5.9 Jake brake
I have a 1999 Discovery with the cummins 5.9 and Allison 3000 6 speed automatic and what is labeled as a Jake brake. Last trip with no warning the brake quit working. I am not familiar with exhaust ...
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OP here and Wanted to give an update. After checking voltage at the switch and air supply and physically moving the jake brake I determined it was an electrical issue. No power at the solenoid. Found a wire coming from the chassis fuse box that had an inline fuse that was blown. Changed out the fuse and it powered the solenoid and brake seemed to be working. Took for a test drive and 10 minutes in no jake brake and fuse blown again. Climbed underneath and traced all 36+ feet of wire and no signs of damage. Decided to change fuse and give it another go. Went to open the fuse holder and the butt end connector fell apart in my hand. Crimped in new fuse holder and made our Thanksgiving trip and the brake worked perfectly. One $3 dollar fuse holder with a bad crimp but at least now I have a better idea of how the system works.
