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Author
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Topic: battery shut-off
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smblk t-bolt
Journeyman Posts: 67
From: port alberni BC Canada
Registered: Apr 2002
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posted 07-23-2002 04:04 AM
   
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
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posted 07-23-2002 07:48 AM
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
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posted 07-23-2002 08:31 AM
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
1.56 60 ft.
http://prestage.com/site/site_display.asp?SiteID=141
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Moneymaker
Administrator Posts: 19704
From: Lyons, IL, USA
Registered: May 99
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posted 07-23-2002 10:51 AM
Correct.  ------------------
Alex Denysenko
Co-Administrator and Moderator/ non 65-66 Mustang owner sensitivity co-ordinator NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
Professional Manwhore
The Barry of BarrysGrrl
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smblk t-bolt
Journeyman Posts: 67
From: port alberni BC Canada
Registered: Apr 2002
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posted 07-23-2002 09:49 PM
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 againron
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steve'66
Gearhead Posts: 6522
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 07-23-2002 10:20 PM
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
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posted 07-25-2002 11:18 AM
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
351C 4V 8.1s in 1/8
79 Ford Bronco 4 X 4 Lifted 6"
400 9.9s in 1/8 :)
70 Plymouth Cuda'
440 Magnum. 2600#
Race Car 6.90 in 1/8
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kid vishus
Gearhead Posts: 4538
From: middle of NC
Registered: Oct 2000
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posted 07-25-2002 11:41 AM
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
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posted 07-26-2002 04:59 AM
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
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posted 07-26-2002 07:03 AM
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
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posted 07-26-2002 07:02 PM
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
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posted 07-27-2002 12:59 AM
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
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posted 07-27-2002 12:13 PM
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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