>>On Jul 6, 2011, at 2:54 PM, James Hays wrote:
Hi Gang: Got my head spinning - need some electrical routing help.
Have GM 350 with PCM Engine Controls. Installed battery electrical shut off
switch on the neg. side & routed a separate ground to the PCM 3 ground wires
for constant wanting constant power as needed to keep the PCM from
re-programming each time you start the engine.
Problem is with the shut off switch open ( off ) still have ground at normal
places - engine, frame & so on. The way I look at it if I ever ( mistake )
try to start the engine with its heavy draw without connecting ( closing )
shut off switch I will cook the light weight wires in the PCM.
Is there any way to have constant energy for the PCM ( and radio clock ) &
still have a main shut off switch - like it to be neg. but would settle plus
side if it will just work without cooking stuff.
Thanks,
Jim
55-1st PU 5 window / 350/ 4L60E
-----------snip----------
Why the electrical shutoff?
What are PCM engine controls?
Gale Gorman
Houston
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