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Re: one wire altenator ?
[Re: jbcuda]
#613911
02/15/10 10:59 AM
02/15/10 10:59 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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The accepted rule for an 8 ga lead from the batt in the eng compartment over to the alt is one 2 sizes smaller (12 ga) but w yours being in the trunk I do not know if that changes that requirement.
live every 24 hour block of time like it's your last day on earth
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Re: one wire altenator ?
[Re: Stanton]
#613914
02/15/10 11:25 AM
02/15/10 11:25 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I was wondering that too where is the main feed routed to the starter. I agree w Stanton & run the 8ga from the trunk to the starter relay batt stud then an 8ga from there to the alt & protect that line w a 12ga FL. then the Q is do you want this main lead from the trunk forward to be hot all the time or disconnect it in the trunk w a (furd type but constant duty) solenoid not a parts house furd type.(they wont handle constant "on") EDIT made a mistake, the cables from the trunk to the starter need to be much larger than 8ga like double ought (00) then 8ga from the starter relay to the alt protected w the 12ga FL
Last edited by RapidRobert; 02/15/10 11:35 AM.
live every 24 hour block of time like it's your last day on earth
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Re: one wire altenator ?
[Re: jbcuda]
#613916
02/15/10 11:59 AM
02/15/10 11:59 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Main hot (00) from the trunk to the fender starter relay batt stud then an 8ga from that stud over to the alt (protected w a 12ga FL). some people prefer to disconnect/connect the "main hot" at the trunk battery with a solenoid so that this line is not "on" all the time which could have catastrophic results if something sharp in the route from trunk to front would cut the cable or if something up front would develop a dead short and the solenoid commonly used for this in the trunk next to the battery is a ford type that originally was on the fender on most early (of our era)fords. However the ones commonly sold in parts houses are made for intermittent duty (like when the average furd takes 2 minutes of cranking to start ) whereas one for this type of app will be "on" all the time the eng is running so an aftermarket "constant duty" ford type is needed. Myself I never sweated having the big cable running to the relay hot all the time even though I am as safety conscious as the next guy and I insulated all sharp edges very well when I routed it but some prefer it switched and some racing classes require a manual cutoff switch mounted outside the rear of the car by the bumper to interrupt the negative cable to the trunk floor.
Last edited by RapidRobert; 02/15/10 12:07 PM.
live every 24 hour block of time like it's your last day on earth
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Re: one wire altenator ?
[Re: Stanton]
#613920
02/15/10 01:39 PM
02/15/10 01:39 PM
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Joined: Apr 2003
Posts: 3,968 North Riverside IL & Lowell IN
GTXKen
super gas
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super gas
Joined: Apr 2003
Posts: 3,968
North Riverside IL & Lowell IN
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Quote:
GTXKen ... what are you using for a starter relay and where is it installed?
The stuff at this link really explains how to safely do a trunk-mount battery installation
http://www.madelectrical.com/catalog/tm-1.shtml
I used the MAD method when I installed my battery in the trunk. The stock relay is wired to the ignition and neutral safety switch per normal but then it is used to power up the relay in the trunk that opens up the BIG relay circuit and sends power to the starter. The big wire on the starter has a jumper to the solenoid wire so the starter has only one wire running to it. I use a stock type starter relay mounted under the dash, in fact nearly everything is mounted under my dash, coil, MSD, fuse box and starter relay.
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