![]() | Home > Maintenance & Mods (L322) > An upgraded dual battery idea. |
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barracuda816 Member Since: 11 Jun 2012 Location: oxfordshire Posts: 213 ![]() ![]() ![]() |
Hi guys,
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mzplcg Member Since: 26 May 2010 Location: Warwickshire. England. The Commonwealth. Posts: 4029 ![]() ![]() ![]() |
The only fly I can see in that wee pot of ointment is this. If you actually do flatten the second battery, where does the +12v come from to fire the solenoid?
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nicedayforit Member Since: 11 Jun 2011 Location: Beside the Solway Posts: 3977 ![]() ![]() ![]() |
Mostly nothing wrong with what you are proposing. A lot of people have done the same to other vehicles in the past, me included.
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mzplcg Member Since: 26 May 2010 Location: Warwickshire. England. The Commonwealth. Posts: 4029 ![]() ![]() ![]() |
Erm NDFI, I reckon you missed the point. Read the OP again. He wants to put the relay in the earth of the MAIN battery. So if the 2nd one is flattened the starter battery is still good. |
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nicedayforit Member Since: 11 Jun 2011 Location: Beside the Solway Posts: 3977 ![]() ![]() ![]() |
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wats39 Member Since: 08 Jul 2012 Location: fife Posts: 77 ![]() ![]() ![]() |
When i changed the battery on mine iirc there were 2 positive red cables. 1 that went to the jumper post then looked like it went straight to the starter and the other with the explosive charge on it into the inside behind the fusebox area. could you not disconnect the explosive charge cable and fit a relay between it and the battery and have the relay switched with the alternator when the engine starts. this would then keep the front battery for starting only and the battery in the rear for powering the rest of the vehicle and when the engine starts, both batteries will charge. '04 td6 se
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barracuda816 Member Since: 11 Jun 2012 Location: oxfordshire Posts: 213 ![]() ![]() ![]() |
Excuse the very poor, very basic (extremly quick using paint) wiring diagram.
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wats39 Member Since: 08 Jul 2012 Location: fife Posts: 77 ![]() ![]() ![]() |
Dont see why your idea wont work. what you will have to do though is fit a diode on the +12v ignition feed to the relay though or when you connect your 18v back up batteries it will put 18v through the rest of your ignition circuit. either that or disconnect the + wire to the solenoid before connecting your back up batteries. have you priced one of those relays? doesn't look like it would be cheap. '04 td6 se
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barracuda816 Member Since: 11 Jun 2012 Location: oxfordshire Posts: 213 ![]() ![]() ![]() |
To be honest I haven't priced the continuous duty contactors. I am going to try and do that today.
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mzplcg Member Since: 26 May 2010 Location: Warwickshire. England. The Commonwealth. Posts: 4029 ![]() ![]() ![]() |
You know what.....here's a better idea. What you need is capacity TBH. You'd have to live in the car watching TV for a week to flatten this.
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Joe90 Member Since: 29 Apr 2010 Location: Hampshire Posts: 6409 ![]() ![]() |
What about all this stuff in relation to toxic fumes? If the battery has a breather, can one poke it into the air con vent?
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barracuda816 Member Since: 11 Jun 2012 Location: oxfordshire Posts: 213 ![]() ![]() ![]() |
To be honest 165 ah isn't that hard to drain to a point where it won't start the td6. But unless I find a cheaper solenoid ( the cheapest I am comfortable fitting is £130 |
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nicedayforit Member Since: 11 Jun 2011 Location: Beside the Solway Posts: 3977 ![]() ![]() ![]() |
Having roughly measured the space in the rear for a second battery I think it is a possibility that the standard 110A Bosch / Varta battery could be persuaded to fit.
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Alistair Member Since: 11 Feb 2011 Location: Peterborough / Bordeaux / Andorra Posts: 7937 ![]() ![]() ![]() |
You need a properly sealed battery in the passenger compartment - Bosch/Varta aren't. You could vent them somehow, but it's going to be hassle.
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