hotwrench500

84superdog: Thanks for responding. in answer to you post; no sir, well not sure. The rig failed to start so I opened the harness to check individual wires for breaks, shorts rub throughs...whatever. found nothing. so cycled the key from off to run 3-4 times and started, ran a minute and stalled. cycled again started ran stalled. noticed the shutdown relay was hot, swapped with horn relay started and ran great. picked up new relay and trucked never missed a beat for a month then same symptoms started again. leaning towards Bosch module but not too sure. no codes in ecm. engine brake solenoids ohm fine, new wires internal and external to engine brake solenoids, new power-up solenoid and new engine brake relay. been looking for a manual but no luck. Thanks for the help.

Hi, my friend has a 93 ch613, it is stalling intermittently while engine braking. Additionally it will not start intermittently, but cycling the key from off to run 3-4 times and it fires up normally. have replaced wires for engine brake solenoids (internal and external), power up solenoid, shut-down relay and engine brake relay. Found no codes, current or history. So I am looking for a place to buy a 12ms45m5 bosch module for it. Im not sure it is the problem but don't know what else to try. Thanks.

Thanks anyway, I figured it out.

Hi everyone, I was wondering if anyone has had a similar problem as mine. This 1993 ch613 starts awesome and runs well but for the last year plus the truck stalls randomly. It is almost always while engine breaking, but several times it has failed to start. By fail to start I mean if I engage the starter for 5 revolutions and it isn't running it isn't going to start, if I cycle the key; as soon as the starter engages its running. only once did I have to cycle a third time. I have had several mechanics look at it several times but with it running fine at the time they can't find anything wrong. Any help or insight would be greatly appreciated. Thanks, hotwrench500