Trunk mounted battery

crackedback said

YOU ARE SO WRONG and off base here. What about the backfeeding that will occur?

You want to debate, start a new thread thread with the rest of the guys pissing in this guys thread, who happens to be going to an NHRA track, where you all can discuss such tom-foolery of extra parts to make the car safer.

People wonder why I don't post as much here, here you go!

Click to expand...

You can theorize all you want, in the past when I HAVE put the kill switch in the pos side it has killed the engine and all electricals when turned off. The difference is that I did not use a one-wire, self-exciting alternator. AFAIC those are the problem and the NHRA tried to solve it the wrong way. If they don't really understand the problem or electricity they should educate themselves before making a rule. AFAIC it should be simple, does turning off the kill switch kill the engine and the fuel pump? If yes, the car passes. If no, then it doesn't pass. That is what this is all about, turning off the engine and the fuel pump in the event of a crash to buy the driver more time to get out of the car or be pulled/cut out.

If the OP insists on using a self-exciting alternator then there are exactly two options to meet the NHRA rules. One is to run the charge wire to the battery side of the battery kill switch. The other is to use a constant duty solenoid, rated for at least the alt's max output. The Ford type of starter relay/solenoid is not constant duty and is not a good choice for this use at all. The common choice will be a Cole-Hersee product, which are good enough parts for what they are intended to do, but I wouldn't stake my life on them.

If the solenoid isn't mounted within a couple wire inches of the alternator or there is no solenoid, then good practice dictates that it be fused or have a breaker close to the alternator. No, I've never seen an OE do this either. Doesn't make it right, just economical for mass production. If this wire is to make the run to a rear mounted battery kill switch then good practice also requires a fuse or breaker at that end of the wire.

Your attitude is what started this, I only responded to it. I wouldn't call 12k+ posts hardly posting, but what do I know?