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Question for the Auto elecs

For all things Electrical.

Moderator: -Scott-

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Question for the Auto elecs

Post by 6.5 rangie »

I'm installing my batteries in the rear of my Rangie and was just wondering the best way to wire them.
I was planning to run 2 positives and 1 negative to the engine bay aswell as eathing the body back at the batteries.
1 positive to do the starter, alt, etc... The other to do the accessories and winch. A solenoid to run them in parallel when the car is going.
What i need to know is the 1st positive running to the engine bay, can it also be used to charge the batteries or do i need to run another cable back to the batteries. Also i'm running 70mm2 cable.
Cheers Damien
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Post by cloughy »

70mm2 csa :shock: no voltage drop for you, there is no reason why you couldn't attach the charge wire from your alternator to your little cable ;) at the starter motor/term block/WTF you plug that big sucker into in the engine bay
Wanted: Car trailer or beaver tail truck, let me know what you got
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Post by 6.5 rangie »

Am planning on running it all to terminal block (nuetral bar) and branch off from there.
70mm2 ain't that big but it is dam costly now after the cable price rise, lucky i got it just before it went up. good for 250+ amps each :D
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Post by ausoops »

sounds all sweet, 70mm is good, is it double insulated? perhaps wack a 400A (or whatever the max your winch will pull), fuse in at both ends so if it rubs through it won't catch on fire. (fuse both ends as a fault could be fed from both the bat and from the alt.

also the neg is a good idea to carry and excess return current whilst winching, earth it to the chassis at both ends and all will be good.
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Post by -Scott- »

ausoops wrote:sounds all sweet, 70mm is good, is it double insulated? perhaps wack a 400A (or whatever the max your winch will pull), fuse in at both ends so if it rubs through it won't catch on fire. (fuse both ends as a fault could be fed from both the bat and from the alt.
Technical point: Fuse to limit alternator fault current only needs to carry max alternator current. Alternators rarely generate full rated current for long; to begin with, I'd choose a fuse rated at max alternator amps.

Cheers,

Scott
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Joined: Wed Jul 27, 2005 10:17 pm
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Post by 6.5 rangie »

Cables are double insulated, each in corrigated conduit, all heat shrinked toigether.
Winch pulls 400 amps, have to look into fuses, might look at DC circuit breakers though, depends on the $$$$
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