Sometime this winter my “Jeeputer” broke, would not boot, wasn’t getting power basically. First I pulled the computer and test booted it on my bench as all the other accessories were fine, I assumed hardware issue. The PC tested booted right up with my power supply so the next step was to check the PC leads. There are 3 leads; 12v power, Ground, and 12v ignition on. The power supply is smart enough to only trigger boot on 12v ignition. The headers on the motherboard connect to the power supply (DC to DC) and trigger a power button action when 12v ignition is sent. When 12v ignition is cut it waits 30 seconds and triggers the power button again. I currently have the power button set to sleep so it’s a fast resume when I start the Jeep back up. I have a relay feeding the 12v always on power in case I need to hard reboot or if I don’t want the computer on for whatever reason.
I started by checking the neon power distribution unit I put in to control all of my accessories. I pulled it out, checked all the connections underneath, and everything looked good. I put the PDU back and moved on to the switches. These are LED switches so I know they are getting power, but I moved from 1 spot on the PDU to another (from 1 to 7) to see if there was a break in the switch wire that triggers the relay. As I moved over to check the power coming from relay 7, I traced the power line to the PC and found the culprit, a bad wrong sized connector… Lesson learned here, no more connectors and I’ll be checking these connections first next time.