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Relocating battery to the trunk

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Relocating battery to the trunk

Old 02-23-2019, 11:25 AM
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Relocating battery to the trunk

Hitting a little snag here.. Pls halp

Where the hell hell can I pass these bastards through the firewall? 0GA



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Old 02-23-2019, 12:57 PM
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Originally Posted by ChrisMan287 View Post
Where the hell hell can I pass these bastards through the firewall?
Anywhere you want to really ...






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Old 02-23-2019, 02:46 PM
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There are some big rubber grommet accessible from the wheel wells. Remove the inner splash shields, you'll see them.
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Old 02-24-2019, 04:20 AM
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Why, exactly, is it you’re wanting do do this?

No criticism, just curious.
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Old 02-24-2019, 06:46 AM
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Trying to avoid using ring terminals as I don’t have a crimping tool for this gauge. I’ll remove the splash shields and check back in. Thanks guys.
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Old 02-24-2019, 03:02 PM
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Mission accomplished thanks JSutter for the idea. I drilled some 3/4” holes behind the splash shield.





Now to decide if I should run the wire down the passenger side and across the front or across the firewall and down the driver side...
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Old 02-24-2019, 03:28 PM
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perhaps it would be superior to pass the cables thru rubber grommets installed in the holes in the body - so the insulation on the power cables doesn't scrape off
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Old 02-24-2019, 03:44 PM
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I insulated everything with liquid rubber afterwards.
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Old 02-24-2019, 06:35 PM
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Originally Posted by reallywildstuff View Post
perhaps it would be superior to pass the cables thru rubber grommets installed in the holes in the body - so the insulation on the power cables doesn't scrape off
Agreed. My preferred choice over liquid rubber.

And why down the passenger side? I get you're putting the battery on the right side of the trunk for weight distribution, but I would have ran it down the drivers side to make running it in the engine bay easier and cleaner. It's easier to hide those cables going across the trunk.

And why run the negative? All you had to do was ground the battery to the chassis inside the trunk. Then ground the negative in the engine bay to the chassis somewhere as well, no?

Last edited by The Wizard; 02-24-2019 at 08:59 PM.
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Old 02-25-2019, 08:11 AM
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After I run the wiring to the driver side and put the carpet back I'm going to inspect where they pass through the firewall and see if the wires have moved. I will add grommets if I have to.

Down the passenger side seemed easier to me. I'm not worried about how they'll look in the bay I can always put loom over them to hide them if it bothers me enough.

I was doing some digging and decided to go the two wire route for this reason:

"In a dual wire solution you have the same large currents in the 12V wire, but you now have the exact opposite current (Kirchoff again) in the 0V wire returning to the battery. if you carefully run the two wires together then the magnetic field of one exactly matches the magnetic field of the other, but since the currents are opposite so are the fields. And they cancel perfectly. No magnetic field means no coupling or interference. There is still a strong field between the 12V and 0V wires but outside there’s nothing. So minimal interference occurs."
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Last edited by ChrisMan287; 02-25-2019 at 08:24 AM.
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Old 02-25-2019, 10:21 PM
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Originally Posted by ChrisMan287 View Post
After I run the wiring to the driver side and put the carpet back I'm going to inspect where they pass through the firewall and see if the wires have moved. I will add grommets if I have to.

Down the passenger side seemed easier to me. I'm not worried about how they'll look in the bay I can always put loom over them to hide them if it bothers me enough.

I was doing some digging and decided to go the two wire route for this reason:

"In a dual wire solution you have the same large currents in the 12V wire, but you now have the exact opposite current (Kirchoff again) in the 0V wire returning to the battery. if you carefully run the two wires together then the magnetic field of one exactly matches the magnetic field of the other, but since the currents are opposite so are the fields. And they cancel perfectly. No magnetic field means no coupling or interference. There is still a strong field between the 12V and 0V wires but outside there’s nothing. So minimal interference occurs."
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Ive seen some BMW's stock in the trunk. I'll see how they do it.

I'am curious about this now.
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Old 03-15-2019, 08:48 AM
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Decided to run the positive and negative next to each other both in the cabin and in the bay across the firewall and over to the driver side.




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Old 03-15-2019, 08:51 AM
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Started setting up the ground distribution block last night. 0 GA wiring is going to stock ground point on the motor. Still have to add ground from trans to distribution block as well as other points in the bay and back at the battery from it to chassis.



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Old 03-15-2019, 08:58 AM
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Waiting for another distribution block for the positive so decided to work in the trunk.

Set up the circuit breaker for the positive side and started playing around with mounting for the battery bracket. Using the stock bracket that will be cleaned up and painted wrinkle black.




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Old 03-15-2019, 10:36 AM
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Battery bracket painted.


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Old 03-15-2019, 01:22 PM
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I'm curious about what benefit's there might be from relocating the battery to the back of the car.

Seems like a lot of work. I'm sure you have a good reason for doing this.
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Old 03-15-2019, 02:19 PM
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Originally Posted by JvG View Post
I'm curious about what benefit's there might be from relocating the battery to the back of the car.

Seems like a lot of work. I'm sure you have a good reason for doing this.
He's making room for his Turbo project. See post 5.
It's being installed on the passenger side to help with weight distribution.

Looking good Chrisman, keep up the good work.
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Old 03-15-2019, 07:08 PM
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ive been wanting to ask:

“Weight distribution” vis-a-vis “what” ?

the weight of the driver ?
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Old 03-15-2019, 07:45 PM
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Ok, battery relocation project makes sense now.

Cool project.
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Old 03-15-2019, 08:01 PM
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That better be a sealed battery. If not, get a battery box and vent it properly.

Do you plan to go to the race track? There are some things you need to pass tech.
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Old 03-16-2019, 05:48 AM
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It’s an AGM sealed battery (Bosch Platinum).
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Old 03-16-2019, 03:02 PM
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Battery mounted I cut an access hole for the circuit breaker, trimmed the carpet around the tray and drilled holes through the scissor jack access cover for the wiring to pass through cleanly.



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Old 03-16-2019, 04:05 PM
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Nice job!
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Old 03-18-2019, 09:10 AM
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Buttoned everything up, flipped the switch on the breaker and there was no power going to the car. Confirmed that the breaker is bad even though it was new (open circuit no matter which way it's flipped).. ordered another one will check back in once it's done.

I really should have tested it beforehand

Last edited by ChrisMan287; 03-18-2019 at 09:13 AM.
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