Engine Brake ISL 425
The saga of my intermittent Engine Brake continues. I have replaced the OEM switch that CC install for Hi-Off-Lo at the dash, I have checked out all the connections in the bay under the driver and have isolated the Brakeswitch.com box out of the circuit, but no solution so far; except I now have a definitive repeatable time/distance frame. I know I can drive about 20 miles or so and then the engine brake starts to become intermittent for a couple of times then ceases completely (in either Lo or Hi setting). It does not resume after engine restart except after an undetermined period of the engine being off. After it fails the light at the OEM switch continues to work when the accelerator is released and Hi or Lo are selected, suggesting that the problem is after the switch.
I have now found a relay in the mix, in the drivers bay, it is a 301-1C-S-R1 12vdc, a simple plug and play black unit, it is in one of the Bussman fuse boxes along with other relays. I have ordered a replacement.
One of my issues is that to test any change requires an hour or so round trip to confirm.
I have been unable to find any advice to confirm that a relay could fail in this way; i.e. work for a short period then get stuck, maybe due to heat or whatever which clears itself after cooling down. I do not know how to test the original relay to confirm if it is the cause. Anyone have any clues or experience with relay failure?