cucvrus
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BINGO. Give this man the prize. That is the only time I have seen issues with the stock set up. Low batteries. You my friend are a genius. Thank you. Thank you.Having given serious thought to a battery cut off, it is more complicated than is practical, a 24V cut off is a big switch that is not easily mounted and not easily protected from shorts and just cutting off 12V during a run on can cause worse or further damage I have heard. When my run on happened the batteries shot out molten lead and acid, and it wasn't exactly like I wanted to be messing around with a shut off at the time and running it into the cab meant further potential failures from a cable rubbing through, being too long and higher resistance or a short across the terminals. In the end, I just rebuilt everything back to new, I already had done the doghead mod and I upgraded all the battery cables to one gauge up. It was a pain and time consuming, but now I just pay attention to the battery gauge and if it is in the yellow and not just when the glow plugs are running, I wouldn't turn the key. My issue was a fused solenoid contact on the starter and not the relay and my fatal flaw was keeping old crappy batteries because I wanted to do batteries last after I had everything else fixed so I would not potentially ruin batteries with a lot of down time on a vehicle I was working on. I would have been money ahead changing the batteries twice in hindsight.
Cutting the cable to the starter couldn't hurt a thing, as far as I can tell. But disconnecting the batteries (negative or positive side) with the engine running would make the alternators unhappy, wouldn't it?I never done it but it would work and the truck would work fine all day long after starter. So big switch on. Start the truck. Big switch off and live happily ever after. Am I missing anything?
I thought CUCVRUS meant that this was once the engine was running, and without stuck relays or starter solenoids, or other malfunctions.reread the first statement in post # 89.
HmmmI thought CUCVRUS meant that this was once the engine was running, and without stuck relays or starter solenoids, or other malfunctions.
Your correct about this problem. GM had this issue for several years in the 1980's with quite a few trucks. I have just installed a higher amp relay in all the 1980's GM trucks I have owned ( 5 now) . Another major problem GM had with their starters was "heat soak" . Shut off the vehicle after driving for awhile and the starter would not work. Installing heat shields helps, but going with larger relays and power cables works even better.Simply said, if you read the forums here , you will find well over a 100 people(actual amount is probably much higher) that have experienced starter run-on.
The doghead relay modification definitely will help eliminate this from ever happening(before it happens).
Other situations can still occur that will allow it to happen.
Nothing is fool proof.
I'm 100% sure that I have helped hundreds of people with this idea.
If there was no malfunction(need for emergency action), why would you cut the wire with wire cutters?I thought CUCVRUS meant that this was once the engine was running, and without stuck relays or starter solenoids, or other malfunctions.