mack88 Posted March 25, 2017 Share Posted March 25, 2017 bought 87 mack noticed jake dosn't work wiring from motor to cab looks good,also fuel gauge when key is off gos to 1/4 on gauge, turn key on it gos to empty.Any ideas on these two things.Thanks Quote Link to comment https://www.bigmacktrucks.com/topic/49283-jake-brake/ Share on other sites More sharing options...
alex g Posted March 25, 2017 Share Posted March 25, 2017 Engine brake could be a Lot of things. Micro switches to solenoid in heads. You could start with putting power to solenoids that run engine brake in heads and see if there working. If they are start tracing back from there. Your fuel gauge is probably sending unit in Tank.Sent from my SM-J320W8 using Tapatalk Quote Link to comment https://www.bigmacktrucks.com/topic/49283-jake-brake/#findComment-365462 Share on other sites More sharing options...
Ezrider Posted March 25, 2017 Share Posted March 25, 2017 where i normally start with diagnosing a jake break problem is idle the engine up to 11-1200 rpm unplug the pass threw connectors and apply + power to the each pass threw individually and see if it activates the Jake break. this will tell you if the isues is under the valve cover or electrical before it gets there. Quote Link to comment https://www.bigmacktrucks.com/topic/49283-jake-brake/#findComment-365463 Share on other sites More sharing options...
fxfymn Posted March 25, 2017 Share Posted March 25, 2017 I'd check the micro switch under the accelerator pedal first. Not uncommon for them to get gunked up. Disconnect the leads from the fuel gauge at the sender and touch them both to ground. If the gauge reponds it is a bad sendng unit. Quote Money, sex, and fire; everybody thinks everyone else is getting more than they are! Link to comment https://www.bigmacktrucks.com/topic/49283-jake-brake/#findComment-365464 Share on other sites More sharing options...
mack88 Posted March 25, 2017 Author Share Posted March 25, 2017 Thanks for the replies i wil check those things. Quote Link to comment https://www.bigmacktrucks.com/topic/49283-jake-brake/#findComment-365469 Share on other sites More sharing options...
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