Battery master switch

[1934sedan]

Hey guys I am installing  a two stud battery master switch.  I am going to cut the ground by running a wire  from the negative battery terminal to one side of the switch and then running a wire from the other side of the switch back to the negative battery terminal.    How will this work?

[VMS Motorsports]

It will break the ground circuit

[1934sedan]

Will it work properly though?

[VMS Motorsports]

I've never had one in my car, but that doesnot sound like it would work. If both cables go to the negative battery terminal, wouldnt it complete the circuit?
Maybe I'm over-tired...

[Legends57x]

Per instructions I received with my battery disconnect switch several years ago from Speedway, it shows to splice this switch between battery and starter solenoid within positive cable, not ground cable.  In theory, splicing this switch into the ground cable should work also, but you must run one side of switch to battery and other side to chassis ground.  No Jim, you're not too tired....LOL

Good luck! 

[1934sedan]

Ok so I should run from the positive battery post , instead of going to the solinoid that is mounted on the battery box and then up to the switch and then back down to the solinoid to be able to turn it on and off?

[justfreaky]

Read this one Chris:
http://www.legendsracer.com/index.php?topic=750.0

Steve

[amp racing]

most rules are neg first off last on...i would break the ground, then if the comes loose it will not do any weird damage... electronics do not like positve spikes..
joe

[VMS Motorsports]

On our modified, it was set up to break negative. Don't know if it matters that they dont run alternators though

[justfreaky]

I think most folks are using the alternator.
Try this diagram:
http://www.moroso.com/catalog/images/74100-74101_instweb.pdf

Steve

[legends13]

Yes. Cut the ground. I have a friend that races with me, and he is an Automotive electrical mechanic (starters/Alternators/etc..) by trade. I had mine done + side, and he scolded me for it. the issue is if you break positive it can be shorted by anything on the car. If you break ground, and it is shorted, it is still ground. (ground short to ground vs positive shorted to ground). I am simplifying the response, and I might have it slightly wrong, but I believe that was the gist of it.

[racerdad]

I asked this same question and I was told that cutting the ground instead of the possative  would kill the Cdi box so I did the possative.  If you won't to read about it  search ( batt cables).

[dcpainting]

I just hooked mine up wrong and shorted out brand new battery I hooked one up to neg battery post and grounded to battery bracket now so ground side is way to go