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Old 12-04-2010, 03:18 AM   #1 (permalink)
hss
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truck shutting down

hi.
i got an old 1979 ih cabover truck with a ntc 350 cummins 855.
my problem doesnt happen all the time. i noticed that at times my voltage guage drops rite down and if it drops far enough my truck dies. now sometimes i can start it rite up after it dies, but most of the time there may be a couple of minutes that go by then the truck will start. until i let it sit for a while the truck is dead no power at all.
i replaced the 3 batteries,thinking that fixed it, but a week and half later it died on me again.
i was told if it was my alt my truck should keep running.
what do you think. maybe an ignition switch?
thanks for any help or input.

Last edited by hss; 12-04-2010 at 03:20 AM. Reason: spelling
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Old 12-04-2010, 01:01 PM   #2 (permalink)
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I'm not familiar with that engine, but I assume it has a fuel shut off solenoid.
Being a 1979, it would be straight mechanical injection and should continue to run with no battery or alternator input at all. I would check the fuel shut off and associated wiring..could be that something is shorting and causing the shut off to activate. On some engines, the temp or oil pressure senders will trip the fuel shutoff to prevent engine damage...might check those too. The ign switch might also cause this, at it is likely wired to the shutoff also.
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Old 12-05-2010, 02:51 AM   #3 (permalink)
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i will check those out. i did find a loose positive cable going to my battery cut off switch.
do you think that could of been my problem?
thanks
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