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Old 11-02-2007, 12:41 PM   #1
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Trickle charging battery through OBDII port

I use my 2000 TJ mainly as a toad (as in "towed" behind my RV), so it sits for significant periods of time. My problem is keeping the battery charged. Also, when towed the TJ has a brake booster plugged in to an aux 12v cigarette lighter recepticle so there is some discharge during each braking event.

VW ships solar chargers with each of its new cars to reduce the loss of batteries on long shipments. The newer models of these chargers hook into the OBD II port and charge through it. I understand that the OBD II would have have constant 12v from the battery for this to work and some manufacturers have it wired that way and some don't. Given the different key positions available on the TJ for towing-type purposes, I was wondering if anyone knew if the TJ's OBD II port would work with these chargers. Here is a link to one of many Ebay listings for these chargers for reference: http://cgi.ebay.com/ebaymotors/VW-Fa...spagenameZWDVW

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Old 11-02-2007, 12:45 PM   #2
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Originally Posted by Slick View Post
I use my 2000 TJ mainly as a toad (as in "towed" behind my RV), so it sits for significant periods of time. My problem is keeping the battery charged. Also, when towed the TJ has a brake booster plugged in to an aux 12v cigarette lighter recepticle so there is some discharge during each braking event.

VW ships solar chargers with each of its new cars to reduce the loss of batteries on long shipments. The newer models of these chargers hook into the OBD II port and charge through it. I understand that the OBD II would have have constant 12v from the battery for this to work and some manufacturers have it wired that way and some don't. Given the different key positions available on the TJ for towing-type purposes, I was wondering if anyone knew if the TJ's OBD II port would work with these chargers. Here is a link to one of many Ebay listings for these chargers for reference: http://cgi.ebay.com/ebaymotors/VW-Fa...spagenameZWDVW
Is this just to use the Jeeps brake lights while being towed?

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And the most important safety, I never put my booger hook on the bang switch unless I'm ready to fire.
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Old 11-02-2007, 12:51 PM   #3
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The brake booster has a sensor wire to the RV's brake lights. When the RV's brakes are pushed, the booster (which sits on the driver's side floor and is connected to the brake pedal) pushes the brake pedal and when that happens the brake lights on the Jeep come on. So each time I brake I'm using juice to push the Jeep's pedal down and to light the brake lights. The battery tends to get low, based on my perception of the engine turning over more slowily after towing, but I've never completely drained the battery during towing.
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Old 11-02-2007, 01:14 PM   #4
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Thats definitely a cool product, and says it should work with any vehicle with an OBDII connector. And for $12, why not give it a try?
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Old 11-02-2007, 07:21 PM   #5
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It says also it can be modified to plug into the lighter plug.. that is good stuff i never knew they can be that cheap. Usually they are above 100$ level per square ft
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Old 11-02-2007, 08:01 PM   #6
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The brake booster has a sensor wire to the RV's brake lights. When the RV's brakes are pushed, the booster (which sits on the driver's side floor and is connected to the brake pedal) pushes the brake pedal and when that happens the brake lights on the Jeep come on. So each time I brake I'm using juice to push the Jeep's pedal down and to light the brake lights. The battery tends to get low, based on my perception of the engine turning over more slowily after towing, but I've never completely drained the battery during towing.
If it actually pushes the pedal, does it do so enough to actually use the brakes, or just trip the switch and activate the lights?
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And the most important safety, I never put my booger hook on the bang switch unless I'm ready to fire.
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Old 11-05-2007, 10:22 AM   #7
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It pushes hard enough to apply the brakes. The force that applies the brakes is actually adjustable and can be adapted to different vehicles.
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Old 11-05-2007, 01:02 PM   #8
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I flat tow my Jeep behind my motorhome as well. I have my braking system wired to get power from the motorhome so it eliminates the problem you are having. I also have my lights independently wired so that when I'm towing, there is no power running through the Jeep's wiring.

My Jeep is also my daily driver, so it doesn't sit much.

If I was going to use something like a solar charger, I think I'd hook it directly to the battery. It will probably never happen, but a surge running through your system might fry your ECM and then you'd be in a world of hurt.

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