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Linking the two batteries together

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Linking the two batteries together

Postby JassyTheDog » Wed Apr 07, 2021 6:46 pm

I wondered if any has linked the two batteries (crank/start and aux). Normally they are separate until the engine is running. The reason I ask is that I have added a solar panel and 2 x leisure batteries with a split charge relay to the van I have converted to a camper. What I would really like to do is to link the two under seat batteries permanently so the split charge keeps them both topped up using solar power when the van is not used for some time.
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Re: Linking the two batteries together

Postby knobby1 » Wed Apr 07, 2021 8:31 pm

JassyTheDog wrote:I wondered if any has linked the two batteries (crank/start and aux). Normally they are separate until the engine is running. The reason I ask is that I have added a solar panel and 2 x leisure batteries with a split charge relay to the van I have converted to a camper. What I would really like to do is to link the two under seat batteries permanently so the split charge keeps them both topped up using solar power when the van is not used for some time.


Mk6 or Mk7..?? You don't say which you have. Mk6 twin batteries are connected in parallel anyway. Mk7 are not.

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Re: Linking the two batteries together

Postby JassyTheDog » Thu Apr 08, 2021 6:50 am

Sorry it's a MK7, they get link together once running only.
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Re: Linking the two batteries together

Postby Jim Archer » Thu Apr 08, 2021 10:19 am

Mk7 relay connects both for starting.

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Re: Linking the two batteries together

Postby Altransit » Thu Apr 08, 2021 1:52 pm

Removing the big relay and replacing it with the solid link that's in the single battery fusebox, will do what you want.
Battery_Fuse_Box (8).JPG

Battery_Fuse_Box (5).JPG

I'm not sure that it's a great idea though, as you have no battery backup for starting if you run the batteries down :?
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1997 Mk5 SWB 115 Minibus 70ps Di (Gone, but not forgotten!)
2004 Mk6 SWB T280 Medium Roof 85PS 2.0 TDDi - Vantunered (Also gone)
2008 Mk7 SWB T280 Medium Roof 85PS 2.2 TDCi - Also Vantunered
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Re: Linking the two batteries together

Postby loot » Thu Apr 08, 2021 2:02 pm

Go to www.etis.ford.com and in 1 of the sections is bemm it is very useful and shows how to connect the batteries and their configurations, it even has 3 shown
56 350 2.2 130ps mk7 with 2 side doors 8)
65 290 2.2 125ps custom with 2 side doors 8)
07 350 170ps
[img]http://[/img]
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Re: Linking the two batteries together

Postby ned » Thu Apr 08, 2021 5:48 pm

Link them like this :lol: :lol:
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Re: Linking the two batteries together

Postby Altransit » Thu Apr 08, 2021 7:27 pm

ned wrote:Link them like this :lol: :lol:

I'm glad to see that the BJT school of faults and fixes is still alive and kicking :P :lol:
1997 Mk5 SWB 115 Minibus 70ps Di (Gone, but not forgotten!)
2004 Mk6 SWB T280 Medium Roof 85PS 2.0 TDDi - Vantunered (Also gone)
2008 Mk7 SWB T280 Medium Roof 85PS 2.2 TDCi - Also Vantunered
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Re: Linking the two batteries together

Postby ned » Thu Apr 08, 2021 9:53 pm

Altransit wrote:
ned wrote:Link them like this :lol: :lol:

I'm glad to see that the BJT school of faults and fixes is still alive and kicking :P :lol:

I think a little bit of BJT rubbed up sorry I mean rubbed off on all of us :lol: :lol: I’m sure he would have been proud of that bit of ingenuity.
03 transit 125t280 2.0 tdci swb executive college blue 92. Built in Belgium so deserves lots of love. 227,000 miles on the clock.

Another year WITHOUT needing welding 8)
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Re: Linking the two batteries together

Postby loot » Thu Apr 08, 2021 11:31 pm

And offered us an appropriate tool 0000003,a or similar, 2 spanners welded to a length of hedge treasure and some foam tape wrapped round to make it nice to touch :P
56 350 2.2 130ps mk7 with 2 side doors 8)
65 290 2.2 125ps custom with 2 side doors 8)
07 350 170ps
[img]http://[/img]
Ids v86 licence + v86.04 update + xprog here
Ids map here
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