Battery disconnect switch

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inkjunkie

inkjunkie

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I did not want to hi-jack this
http://www.forabodiesonly.com/mopar/showthread.php?t=139089
so I figured I would start my own thread. My car, when the day gets here that I put it together will have a substantial amount of electronics in it. Between the efi, trans controller, rpm window switches etc it will have a lot of somewhat "sensitive" stuff in it. In all the reading I have been doing one thing that I have seen mentioned several times is that when the disconnect switch is used a voltage spike occurs, often times taking out something with it. One thing I have read is some folks deal with this by running the charging system trigger wire thru a on/off switch, say a toggle of sorts. When at the track, this switch is left "off" so that the alt. is not energized. Any thoughts/comments/insults or just snide remarks would be appreciated.....:burnout:
 
If you have a large electrical load, running with no alternator will require lots of maintenance at the track. There would be no difference turning off the disconnect switch and the ignition switch. I prefer the two terminal (kiss).
John
 
I don't have a harness yet, I will contact them. The way I understand it is that when you turn the vehicle off with the key, the efi and trans controllers are both disconnected when the voltage surge occurs so no damage happens. The surge goes into the battery, like it is designed to do. When the vehicle is turned off with a battery disco switch, the controllers are still energized but the battery is no longer present in the circuit. The surge is also still present though........
 
A 4 post switch isolates the battery and alternator. Which will kill the engine and keep NHRA happy. I think the rest of the circuit, you could tap a big hot wire, and power your stuff. As long as there is no feed to the coil.
 
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