[Shop-talk] strange automotive electrical problem

[john niolon]

Strange automotive electrical problem we need help with…
55 chevy automatic with 383 stroker motor, carbed, p/s,p/b,a/c
Dakota digital dash system including neutral safety switch and
Transmission gear indicator
 
When it is running right, it’s scary strong.  Cruises nicely.
 
Problem… when driving the engine dies like you cut it off…BUT will start back up
Immediately and run perfectly till the next time it does it.  Might be 15 
minutes…15 days or
three month later. Might do it 4 times in a row or once and not repeat.  Speed 
does not effect it. 
Engine temp does not effect it…  does it hot or cold. With the a/c on or off.  
It does not have a
Cutoff switch in the system.  Longest period with no failure is 7 months… 
shortest was 4 minutes.
 
When it stalls we checked fuel by looking in the bowl of carb and gas is 
spraying as it should
So we are assuming electrical of some sort.  So far we’ve done the following…
 
Replaced battery with new red top optima battery and all new battery cables (2 
gauge I think)
Replaced all ground cables frame/block… frame/chassis with 2/0 welding cable 
with new crimped
connectors and clean, bare metal attachment points
replaced ignition switch (twice… first with import then with oem switch)
replaced coil and distributor with MSD system with spark control box, separate 
coil and distributor…
it was taken from running vehicle.  It's doing the same  thing as the original ignition system.
Replaced complete wiring harness…headlight to taillight with new Autowire harness…including all
Switches and relays. Professionally done.
Everything else electrical works without a glitch…  we are at the wall here…
 
Ideas, suggestions, calculated wild a** guesses welcomed…   
thanks
 
john
 
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