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  #21 (permalink)  
Old 05-23-2021, 04:16 PM
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Kill switch aside, we always disconnected the positive side. That was just the way it was. I still do. All other power systems disconnect the positive side. But the owners manuals for most new vehicles say to disconnect ground. I don't know that it really matters since even with positive connected, nothing can complete the circuit to the ground side of the battery.
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  #22 (permalink)  
Old 05-23-2021, 04:32 PM
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Quote:
Originally Posted by twobjshelbys View Post
I don't know that it really matters since even with positive connected, nothing can complete the circuit to the ground side of the battery.
As kids, another one of out brilliant tests was to disconnect the battery while the car was running. If the car kept running, we knew the alternator was working. Yes, geniuses that we were. We only burned out the charging system half the time doing that. Of course, when that happened we would then proclaim that that was the problem all along and slap each other on the back for being such good automotive diagnosticians. So yes, a car will run (sometimes) with the battery disconnected... just don't do it.
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Old 05-24-2021, 07:37 AM
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This battery kill switch will shut down a running engine...if wired per the diagram.

https://www.pegasusautoracing.com/do...ocID=TECH00109
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Old 05-24-2021, 09:15 AM
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Originally Posted by HTM101 View Post
This battery kill switch will shut down a running engine...if wired per the diagram.

https://www.pegasusautoracing.com/do...ocID=TECH00109
True. You know the funny thing about old Fords, and the way a lot of us have our solenoids and ignition wired in our "historically correct (kinda)" Cobras, is that some of these starter solenoids are prone to sticking in the closed position. This causes the starter to run continuously even while the engine itself is running. However, turning the ignition key “OFF” will not stop the engine because the stuck solenoid is feeding the ignition circuit via the second wire off the solenoid (which was originally used to bypass the ballast resistor). I've seen a zillion Fords wired this way, and a fair number of Cobras (it's even ERA's default method of wiring even with MSD boxes). Since MSD ignitions do not use a ballast resistor, the second wire connection to the starter solenoid can be safely removed and taped off. But if you have an old points type/ballast resistor ignition, you still need it. Somebody's bound to follow this post up with a memory of standing over an idling Ford engine, that has the starter motor running constantly, and they've pulled the key out of the ignition switch and are holding it in their hand thinking. "OK, just what the f*** do I do now?"
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Old 05-24-2021, 05:11 PM
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Last edited by ERA 626; 05-24-2021 at 05:25 PM..
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