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Author Topic:   battery shut-off
smblk t-bolt
Journeyman

Posts: 67
From: port alberni BC Canada
Registered: Apr 2002

posted 07-23-2002 04:04 AM     Click Here to See the Profile for smblk t-bolt   Click Here to Email smblk t-bolt     Edit/Delete Message   Reply w/Quote
okay...this may be a reeeel dumb question but I had a disagreement with someone over this.I wondered why exactly you need a battery shut off when relocating the battery.
he said the tech guy would turn the switch off while your cars running and it should die.any street car Ive ever had would keep running even if you took the battery out.I
hooked mine up to interupt the negative cable..does this matter?the car keeps running if i hit the switch,but off course wouldnt start if the car wasnt running.is the switch supposed to kill the car or just disconect the battery to avoid sparking?sorry if this is too dumb.... :0

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Just Strokin
Gearhead

Posts: 754
From: Tuscaloosa, Alabama
Registered: Dec 2001

posted 07-23-2002 07:48 AM     Click Here to See the Profile for Just Strokin   Click Here to Email Just Strokin     Edit/Delete Message   Reply w/Quote
I would think that the positive cable should be 'switched' not the negative cable. And that the battery wire from the alternator should be attached to the battery side of the switch. This should cut the power to the engine's electrical components for ignition.

Hoping some one will verify this as I will be installing similar switch in street car in the next 3-4 months.

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capri man
Gearhead

Posts: 3385
From: doerun, ga.
Registered: Nov 2000

posted 07-23-2002 08:31 AM     Click Here to See the Profile for capri man   Click Here to Email capri man     Edit/Delete Message   Reply w/Quote
exactly right just strokin. the swith MUST be connected to the positive side of the battery as per the rules. the alt wire must be connected to the battery side of the switch for it to work properly.

------------------
mike r
racing is real
everything else is just a game.
81 capri-7.56 @88mph 1/8
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Moneymaker
Administrator

Posts: 19704
From: Lyons, IL, USA
Registered: May 99

posted 07-23-2002 10:51 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Correct.

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Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator

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smblk t-bolt
Journeyman

Posts: 67
From: port alberni BC Canada
Registered: Apr 2002

posted 07-23-2002 09:49 PM     Click Here to See the Profile for smblk t-bolt   Click Here to Email smblk t-bolt     Edit/Delete Message   Reply w/Quote
Thanks! I pretty much figured that but this guy said"sure, it can be hooked up to the negative cable"I only believed him 'cause he should know better.mind you...he mostly works on ch*vy's.leave it to the ford guys for the right answer! thanks again

ron

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steve'66
Gearhead

Posts: 6522
From: Sonoma,CA,USA
Registered: Mar 2000

posted 07-23-2002 10:20 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Ron,

Yeah switching off the battery's ground won't do it because there are other grounds between the alternator and the engine, like the fact that they are bolted to each other.

SteveW

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64FalconF-16
Gearhead

Posts: 191
From: Republic Of Texas!! Temporarily living in KY
Registered: Feb 2002

posted 07-25-2002 11:18 AM     Click Here to See the Profile for 64FalconF-16   Click Here to Email 64FalconF-16     Edit/Delete Message   Reply w/Quote
Ok, To clarify.

On a race car w/o an altenator you should switch the Negative not the Positive.

Example, On your daily driver. If you replace the Battery you disconnect the Negative first. ALWAYS. When you reconnect with the new battery you connect the Negative LAST.

That is maybe what the brand X guy was referring to.

------------------
64 Pro-Street Falcon
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79 Ford Bronco 4 X 4 Lifted 6"
400 9.9s in 1/8 :)
70 Plymouth Cuda'
440 Magnum. 2600#
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kid vishus
Gearhead

Posts: 4538
From: middle of NC
Registered: Oct 2000

posted 07-25-2002 11:41 AM     Click Here to See the Profile for kid vishus   Click Here to Email kid vishus     Edit/Delete Message   Reply w/Quote
It is supposed to shut the car off when the switch is turned off. When that rule was created, very few people were running alternators, so alot of racers wired it up wrong the first time after they put an alternator on (me included).

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smblk t-bolt
Journeyman

Posts: 67
From: port alberni BC Canada
Registered: Apr 2002

posted 07-26-2002 04:59 AM     Click Here to See the Profile for smblk t-bolt   Click Here to Email smblk t-bolt     Edit/Delete Message   Reply w/Quote
okay...so let me get this straight.switch on the plus side..which wire off the alternator? field,stator or the main battery wire.wouldnt it be easier in that case to wire the coil + side to the switch?(smaller diameter wire)

thanx again

ron

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Just Strokin
Gearhead

Posts: 754
From: Tuscaloosa, Alabama
Registered: Dec 2001

posted 07-26-2002 07:03 AM     Click Here to See the Profile for Just Strokin   Click Here to Email Just Strokin     Edit/Delete Message   Reply w/Quote
Just the battery wire from the alternator attached to the battery side of the switch.

This is not the best diagram to use, but, the big yellow-black is the 65-up diagram comes from the alternator to charge the battery. This is the wire you want to extend and attach to the batter side of the switch. The other wires in the photo have to do with regulating and 'exciting' the diodes to start the operation of the alternator.

http://www.mustangsteve.com/GENtoALT.html

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DidgeyTrucker
Gearhead

Posts: 1057
From: Greenbrier, TN USA
Registered: Oct 99

posted 07-26-2002 07:02 PM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
The cut-off switch is supposed to be able to shut off the car in an emergency by someone outside the car. The normal wiring has the alternator connected to the harness in such a way that it will power the ignition if just the battery is diconnected. This main wire must also be extended to the cut-off switch so that it is disconnected from the wiring harness along with the battery. This will turn the motor off.
Check the September issue of Car Craft. There is an article on page 70 on a new switch that makes this connection easier.

Tracy

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smblk t-bolt
Journeyman

Posts: 67
From: port alberni BC Canada
Registered: Apr 2002

posted 07-27-2002 12:59 AM     Click Here to See the Profile for smblk t-bolt   Click Here to Email smblk t-bolt     Edit/Delete Message   Reply w/Quote
THANKS!
I really appreciate the time people put into this forum to help out others they dont even know.now, a little more wiring and its OFF TO THE RACES!

ron

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John Kolhei
Journeyman

Posts: 46
From: Cottonwood,mn,usa
Registered: Feb 2002

posted 07-27-2002 12:13 PM     Click Here to See the Profile for John Kolhei   Click Here to Email John Kolhei     Edit/Delete Message   Reply w/Quote
So I only have + cable on my shutoff switch Looked at MSD box & thinking about running hot wire to shutoff instead?? This would stop motor right?

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