Leisure battery grounding

[Matt-T68]

Hi Joey
Have you had a look at Lees post?

Thread 'Ignition Live Under Passenger Seat - How Its Done -'

23 Mar 2019

Ignition Live Under Passenger Seat - How its done -



This question pops up fairly often so i thought i would look at it a bit closer. . . . .

If your van was factory fitted with the AUX battery under the seat, then your sorted. There is already a feed under there . . . . =]

BUT what if your van hasn't got the Factory option? . . . . Well there are two options for you.


Run (a new wire) the factory wire from the BCM under the dash/steering wheel

or

Run a (a new wire) from the ignition feed center-line of fuses in the under dash fuse panel...

• Dellmassive
• dellmassive fuse box sh how to guide ignition live solar
• Replies: 84
• Forum: Electrics, Lighting, ICE, Security

• 

 

[Joey7415963]

Thanks for the link but believe me when I say I’ve read everyone of his posts

It’s not that I don’t know what to do in either case, I’ve just no idea how to identify the ignition live wire, what colour it is, where it should be if I have it. I’ve also looked at all those wiring diagrams, but they make little sense to me

 

[Peter1964]

An 645 relais is used for many purposes according a component webshop. This includes rear window heating, air-suspension compressor and headlight cleaning pump. Maybe this give some guidance.

 

[Deaky]

According to the information here. The relay is for a heated rear screen

VW T6.1 Relay Locations

24 Apr 2020

A guide covering all relays installed in vehicle including location and function

• Pauly
• electrics relay t6.1
• VW T6.1 Electrical Info

 

[Joey7415963]

Ok, so can confirm it's the heated rear screen. Thanks @Deaky for the info.

I tried piggybacking the remote to the 12v socket fuse under the passenger seat (that would've been nice) but it stays on even with keys out and van locked!

Guess there's no shortcuts, will have to run a remote from drivers dash fusebox as others have

 

[Joey7415963]

So with the help of the below thread and you guys I finally managed to get it working

An interesting side note in my ventures... The rear window heater relay is always on 12v, the control button however only operates with the engine started. Has anyone ever tried to get an engine running signal off the dash button and hence avoid the bcu rigmarole?

Thread 'T6.1 Ignition Live for DC-DC B2B Charger'

6 Mar 2020

Does anyone know where I can get this? Is it the same as the T6?

• T6Jay
• dc - dc charger ignition live renogy t6.1
• Replies: 34
• Forum: Electrics, Lighting, ICE, Security

 

[dean1971]

I need to run a 95mm cable to ground. Has anyone grounded something that big somewhere in the rear quarter?

 

[JumpShip]

From memory there are earth points inside the rear quarters where the rear lights and other stuff go to .

 

[Dellmassive]

Make a new chassis ground.

Use a m8 or n10 terminal lug.

Then drill a new hole in the rear inner frame, remove paint both sides.

Then just nylock nut, bolt and washers.... To bolt the cable to the chairs....

I don't mine with twin 75mm2.

 

[Dellmassive]

.

Post in thread 'Dellmassive`s Camper Van Adventure'

8 Jun 2025

ELECTRICALS . . .


the 3kva bolted in well.



i kept the NEG as short as possible and made a new ground connection, using a flapper wheel to remove all the pain for a good connection.

we are expecting 300A plus to be going over this link - so it needs to be good.





next up was to re-do the seat base . .




i was using the seatbase at the main NEG. . . so removed all the paint from the 4x bolt holes.





this wire brush drill attachement worked a treat. .



the idea was to spread the NEG load across all four seat...

• Dellmassive

• 
• 

 

[dean1971]

For 95mm cable could I use the old rear seatbelt hole? Would that make a good ground if it was taken back to the metal? It’s a perfect location for my build.

 

[Dellmassive]

For 95mm cable could I use the old rear seatbelt hole? Would that make a good ground if it was taken back to the metal? It’s a perfect location for my build.

View attachment 315631

Don't see why not.... You need a clean metal to metal connection.

95mm2 is well beefcake, so you will need the correct lug for the cable with the correct hole size....

More importantly is the crimp is 100% proper.