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Truck has been sitting for a couple years got it home on a trailer first thing is I changed the spark plugs and drove it down the road for a test drive and the road was a little bumpy just and old frontage road and it hit a little bump and dash goes dark and says no bus I check every connection I could find and nothing sent it to a mechanic and they installed a new ecm and it work got it home and did some work on the transmission plug for the solenoid And took it for a test drive and it ran great for the test drive and on the way back a couple of bumps same spot and goes dark again NO BUS I’m at my wits end on this truck
 

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Look at the TIPM, which is the fuse box in the engine bay. If it has sat for a long time mice could have gotten in and chewed up some wiring so I would do a good inspection of the harnesses.
 
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