4.6 hse power blinks off on bumps

[wanjman]

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.

[Savannah Buzz]

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

[skyguy]

I would check grounding wire.