Simple Battery Cutoff? - Defender Source
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  #1  
Old January 1st, 2011, 11:06 AM
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Mike Deery
1984 D-90
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Simple Battery Cutoff?

I'd like to install a simple battery cutoff in my '84 200tdi d-90. There are no electrical memory issues (ie stereo,etc.). All of the diagrams I have seen for battery cutoffs show wiring schematics that include wiring to the alternator and ignition switch, etc. I was wondering if I could simply wire a 2 pole switch on the seat box and run the truck's negative cable to one post and the same size cable from the other post to the negative terminal on the battery. Essentially, I am looking to deal with a phantom draw on the circuit that seems to be draining the battery when I leave the truck unstarted for a couple of weeks. It doesn't totally discharge it; but, it does weaken the battery. All electrics work and I am not inclined to track down the source of the drain. I thought it would also serve as a mild theft deterrent. Anyway, should the type of wiring I mention as a cutoff cause any type of problems with any of the car's other systems (it has mechanical injection, and it clearly has no computers of which I am aware). Any advice would be appreciated.

------ Follow up post added January 1st, 2011 11:10 AM ------

Sorry, I accidentally posted to the series page instead of the defender page.
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  #2  
Old January 1st, 2011, 12:01 PM
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Neill Thornton
1984 D90 300 Tdi / 1965 Series IIA
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Pretty easy thing to do. Crash303 has a setup for this that' really nice... he uses his to switch the power to the winch on and off, but you could easily do the whole truck's power this way. He used a Blue Sea Systems battery disconnect switch, and then cut a hole in the front of the battery/seat box and mounted it so the switch is operable from the seat.

I think he has pictures somewhere, I will have to look.

------ Follow up post added January 1st, 2011 09:18 AM ------

OK, here is the best picture I can find from his install... the battery cutoff is that black box on the upper left. It is mounted to the front of the seat box so that the knob faced out.

http://www.defendersource.com/forum/...6&d=1288653401

The switch is something like this... it's probably not the exact model, but it's a blue sea switch.

http://bluesea.com/category/1/products/3001
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  #3  
Old January 1st, 2011, 03:33 PM
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Mike Deery
1984 D-90
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Neill-
Thanks for the info and the pix. I think I will use the simple on / off switch from blue sea or perko (if perko has one).
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  #4  
Old January 1st, 2011, 08:51 PM
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Keith Armstrong
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Not nearly as fancy, but I've got http://www.jegs.com/i/Moroso/710/74103/10002/-1?CT=999 on the S1
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  #5  
Old January 2nd, 2011, 08:25 AM
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Mike Deery
1984 D-90
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Clearly, the terminal switch would be effective, but I don't want to have to take off the seat and battery box cover every time I want to disconnect power. A switch on the front of the seat box might just be a little more convenient for me.
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  #6  
Old January 2nd, 2011, 10:41 AM
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J. Michael McCaig
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I have a battery cut-off switch in my '85 110 that I purchased from the local boat store for around $20. I mounted it on the seat box with the face of the switch though the box so it's easily accessible. It is wired just as you suggest...making and breaking the ground lead from the battery. I like it so much that I plan on adding one to my D90.
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  #7  
Old January 2nd, 2011, 04:10 PM
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Mike Deery
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Thanks for the advice guys. I am ready to tackle the job... I think. I'll keep everyone posted.
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  #8  
Old January 3rd, 2011, 09:26 AM
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Tom Rowe
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Whatever you use make sure it has the load capacity for any electrics on the car.
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  #9  
Old January 3rd, 2011, 11:29 AM
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evilfij
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Hella makes one that is close to the one on the NAS 110s.

Nice option to have to save batteries when there is an extended period of disuse.
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