Battery shut-off switch?????
Thread Starter
Staging Lane
Joined: Nov 2001
Posts: 72
Likes: 0
From: West Branch, MI
Battery shut-off switch????? Question for those of you who have relocated your battery and installed a shut-off switch. What connection points up front did you use to insure "complete" shut down? My battery is in, wire is run, now for the final connections. Thanks,
Eric
Eric
TECH Resident
Joined: Nov 2001
Posts: 993
Likes: 0
From: Troy, AL.
Re: Battery shut-off switch????? Any car with a relocated battery must be equipped with a master electrical cutoff, capable of stopping all electrical functions including ignition (must shut the engine off, as well as fuel pumps, etc.). The switch must be located on the rear of the vehicle, with the "off" position clearly marked. If the switch is of a "push / pull" type, then "push" must be the motion that shuts off the switch, and plastic or "keyed" typed switches are prohibited. Also, the battery must be completely sealed from the driver and/or driver compartment. This means a metal bulkhead must separate the trunk from the driver compartment, or the battery must be located in a sealed, metal box constructed of minimum .024 inch steel or .032 inch aluminum, or in an NHRA accepted plastic box. In cars with a conventional trunk, metal can simply be installed behind the rear seat and under the package tray to effectively seal the battery off from the driver. In a hatchback type vehicle the battery box is usually the easiest solution, since the alternative is to fabricate a bulkhead which seals to the hatch when closed. At present, Moroso is the only company which offers an NHRA accepted plastic battery box, part number 74050. All I have been involved with were rear mount batteries with the cut off connection right there. The shortest distance it can be installed from the battery safely to cut power is recommended in order to prevent fires in a accident.
<small>[ May 17, 2002, 02:21 PM: Message edited by: Tums ]</small>
<small>[ May 17, 2002, 02:21 PM: Message edited by: Tums ]</small>
Re: Battery shut-off switch????? Hey thanks TUMS. What I really want to know is the hook up. My installation for my battery in the rear is the red (positive)wire from the battery terminal to the cut off switch and the same wire from the other side of the cut off switch through the fire wall and then to under the hood. Then the positive terminal that once was hooked to the battery is now connected to the new wire from the cut off switch. This installation DOES NOT cut the engine off right away. The engine stumbles for 15 to 30 seconds then cuts off. What is the proper installation??
Thanks
Tom
<small>[ May 17, 2002, 05:19 PM: Message edited by: Tom the roofer ]</small>
Thanks
Tom
<small>[ May 17, 2002, 05:19 PM: Message edited by: Tom the roofer ]</small>
Re: Battery shut-off switch????? Tom, you need to wire the alternator hotwire back through the cut-off switch. It's what's keeping the car running. Usually #4 wire will work sufficiently.
Good luck!
Good luck!
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2016 Z07 Carbon
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Thread Starter
Staging Lane
Joined: Nov 2001
Posts: 72
Likes: 0
From: West Branch, MI
Re: Battery shut-off switch????? Thanks Brady!
Question? To save some wire,could a guy install a small relay to take the alternator field wire out of the circuit when the battery is shut off? Or would the relay current draw be too much on the battery?
Alright, no laughing out loud....
Eric
Question? To save some wire,could a guy install a small relay to take the alternator field wire out of the circuit when the battery is shut off? Or would the relay current draw be too much on the battery?
Alright, no laughing out loud....
Eric
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Verdad Gallardo Re: Battery shut-off switch????? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by y2kss1603:
<strong>Thanks Brady!
Question? To save some wire,could a guy install a small relay to take the alternator field wire out of the circuit when the battery is shut off? Or would the relay current draw be too much on the battery?
Alright, no laughing out loud....
Eric</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You could probably do that, and it would work; but it wouldn't be NHRA legal.. It would take a picky tech to find it..
<strong>Thanks Brady!
Question? To save some wire,could a guy install a small relay to take the alternator field wire out of the circuit when the battery is shut off? Or would the relay current draw be too much on the battery?
Alright, no laughing out loud....
Eric</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">You could probably do that, and it would work; but it wouldn't be NHRA legal.. It would take a picky tech to find it..
__________________
1966 Chevy II twin turbo LS3 project
2016 Z07 Carbon
1966 Chevy II twin turbo LS3 project
2016 Z07 Carbon
Re: Battery shut-off switch?????
Tom, you need to wire the alternator hotwire back through the cut-off switch. It's what's keeping the car running. Usually #4 wire will work sufficiently.
Good luck!
Good luck!
Thanks Brady,
Tom
The Bull
Joined: Jun 2002
Posts: 3,578
Likes: 2
From: Grand Rapids, MI
Re: Battery shut-off switch????? It's pretty simple. If the car is running, the alternator is supplying all the power and the motor is the ground at that point. If you break the ground on the battery nothing will happen. So, instead you simply route the power of the alternator through the battery side of the disconnect switch. #2 or #4 Should work. Then you run another #2 or #4 up to the fuse box and a jumper over to the starter off the disconnect side of the switch. I just used an audio terminal distribution block to jump over to the starter from there, you can also get a bulkhead fitting from summit for 10 bucks to do the same. The rest is simple, battery goes to ground and the positive goes to the switch.
