Older F Series .net

So I know I'm notorious for stupid questions, but I'm thinking I want to move my battery to the box and maybe add another. I might not need the extra battery, but I'm thinking if I'm going to be running my subs, 2 air compressors, as well as lights and accessories, two batteries wouldn't be a bad idea. I'm not sure though, haha this could totally be stupid and unnecessary.

I'd probably have to upgrade my alternator I assume? And moving the battery would probably be as simple as extending the battery cables, correct?

The whole reason for this is because the 18 inch rims on my truck now are gayyyyyy, and I want to run at least a 20. So to be able to lay out I'll need to cut my inner fenders out so that the tires clear, make sense?

Oh, and while I'm here, what exactly does it take to extend the trucks wiring harness? Like how do I go about doing that?

you trying to extend the harness all together or just the battery cables? the cables is easy its a simple kit im sure you can get it from summitracing.com, and i think they are thicker too, and y not 18's in the front and 20's in the rear, they fit a lil better, and using dual batteries is pretty simple as well, but you could also try using capacitor as well. the batteries i think its just hook the positives together, hook the negatives to a ground and you should be good, then run your power to the sylenoid up front, and your good, correct me if im wrong, btw your gonna wanna cover the batteries if your moving them to the bed as well



there are no stupid questions, just stupid people, and sometimes stupid answers

You need to have someone make you a cable that will run from the location in the bed, to the starter solenoid and to the fuse boxes, and a ground that runs to the Frame. You cant just EXTEND the battery cables. You will have to have new ones made, and if thats what your doing, I can give you a guys contact to have them made for you.

Or you can make your own with solder-on connectors. And whether you make or buy, go to larger cables. The increased length will give you a shitload of voltage drop, which you do not need. If you have EFI, you really want to keep the block ground, the PCM is very sensitive to voltage fluctuations. When I moved the battery to the rear of the Mustang, I used #4 cables from the circuit breaker to the solenoid and from the block to the (-) terminal. (With a rear mounted battery, a circuit breaker mounted on the battery box is always a good idea. I used a TI Clix-On 125a breaker) and a #2 cable from the (+) terminal to the circuit breaker.

The tech inspectors at the autocrosses usually take one look at my battery install and sign off on the car; I guess they figure anything that over-engineered has got to be legal.

BTW, if your alternator is big enough to supply all your power needs at max load, you do not need a second battery