Dual battery setup

[maddskillzz 10+ year member]

am i the only one that noticed he has a 200 amp alt and a redtop battery up front and he is only running about 500wrms???

 

[SlickNick 10+ year member]

For the OP's level of power, a chassis ground on the back battery is fine.
However, there have been tests that have shown that a piece of 1/0 wire is MORE conductive than the chassis of a car, which is made of steel (which is FAR less conductive than copper) and lots of welds.

If you plan on running big power, grounds to the front battery/alternator(s) is a must.

^^^^either way, BOTH batteries HAVE to be grounded out to chassis. Regardless of whether or not the flow of electricity goes from battery #1 to chassis or to battery #2, it will STILL have to go to chassis eventually.

 

[maddskillzz 10+ year member]

^^^^either way, BOTH batteries HAVE to be grounded out to chassis. Regardless of whether or not the flow of electricity goes from battery #1 to chassis or to battery #2, it will STILL have to go to chassis eventually.

please elaborate....you seem to know some sort of dc wiring i have never heard of

cause i was almost sure you could take all your car audio stuff and hook it straight to a battery without even having a car

 

[tommyk90 5,000+ posts]

^^^^either way, BOTH batteries HAVE to be grounded out to chassis. Regardless of whether or not the flow of electricity goes from battery #1 to chassis or to battery #2, it will STILL have to go to chassis eventually.

When you take a look at high power applications, most guys will ground the rear batteries to the chassis then have 1-2 runs of 1/0 to the front battery and alternator. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

When it comes to electrical, if it's worth doing, it's worth OVER-doing.

But to be technical, you don't HAVE to ground the rear battery to the chassis as long as you have it sufficiently grounded to the front battery (which is grounded to the chassis and engine).

 

[SlickNick 10+ year member]

^^^^^^well luckily I don't have a high power set up because just getting the one 0 gauge wire from the front to the back was a PITA. I had to drill into the rocker panels.

 

[maddskillzz 10+ year member]

When you take a look at high power applications, most guys will ground the rear batteries to the chassis then have 1-2 runs of 1/0 to the front battery and alternator. //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif
When it comes to electrical, if it's worth doing, it's worth OVER-doing.

But to be technical, you don't HAVE to ground the rear battery to the chassis as long as you have it sufficiently grounded to the front battery (which is grounded to the chassis and engine).

what i was getting at was he was saying it wouldnt work at all without a chasis ground.

 

[tommyk90 5,000+ posts]

what i was getting at was he was saying it wouldnt work at all without a chasis ground.

He does make it sound like that, however I'm not sure if that's what he's saying.

 

[loopkiller 10+ year member]

OK, if you all still need help, see the link in my sig. I made a whole thread to address these issues.