I have a 96' 4.6 HSE and when I hit a jarring bump in my driveway I lose all electrical power for a split second, my radar detector resets, dash lights blink on/off, and the transmission will will go into safe mode getting stuck in high gear. If I shut down and disconnect the battery the trans will reset to normal, but I have not been able to locate the source. I have jiggled and moved around all connectors and wiring under the hood and under both front seats trying to duplicate the problem without successs. Any help would be appreciated. I am searching through the Rave wiring schematics tring to locate major ground connections. Is there a fuse link that controls all engine/ECU power? Thanks, Wanjman.

 

In the RAVE download, there is complete coverage of this vehicle. There appear to be the usual underhood fuse box and fuse links, any of which could have a loose bolt, or be cracked internally. Could also be main ground cable that ties (-) battery to frame of vehicle. Free RAVE download below, the circuit diagrams are in file etlp960e.pdf

 

I would check grounding wire.