electrical short

I`ve got one for you guys that are electrical ''smart .''
I developed a short somewhere , the car runs fantastic ,( 505'' , 68 fastback) , has been rewired from day one , even before I built the engine , has been running great for about 2000 miles .
It has developed a short that completely shuts it off when I hit a bump , it does (so far restart immediatly if I am boing fast enough for trans. to drag the engine over. Or I can slip it in neutral and it will restart immediatly.
I had it running ,up on blocks , well warmed up and was wiggling wires ,when I wiggled the power wire to the ign. switch it died , OHBOY , thot I found it , and rewired the power connector! Took it out to fill with 93 oct. and got out on the hi way hit a transition bump going over a bridge
and it died , but was going probly 75ish ,and it restarted , took her home and quit for the day , bummed out bad !!
I have checked and replaced , or tried switching a lot of parts , .even sent all the major fuel inj. pieces back to FAST to check , no problems there .......

WHAT are some opinions on my problem ? thanks in advance .
Car really gets with the program untill I hit that bump ... ....Bob

Feel around all the wiring connections with your fingertips when that happens. You will definitely feel heat if there is a corroded connection. I have have had those bad connections burn the fingerprints off my fingers when I was looking for the "Short".

Run your fingers down the fuse block terminals and also the firewall harness plug. If it is hot or even warm, there is your problem. Trace it back to the culprit.

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