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Question about 12V charging on Jeep JL while flat towing

Thunder_Mountai
Explorer II
Explorer II
I've flat towed a Jeep a TJ and a JK behind the MH with zero problems. Now I'm getting ready to flat tow my 2018 JL Jeep Rubicon. It is a whole new beast as far as the electrical system goes with it infamous stop/start system and two batteries.

I'm using the Cooltech wiring harness and a Brake Buddy II braking system. I'll power the Brake Buddy from the 12V outlet in the back cargo area since it is live all the time.

So, here is the question. Do I need an axillary charging system to keep the battery up for the Brake Buddy on the JL? Cooltech is pushing their charger. Is it a real need or just revenue enhancement? On the TJ and JK I never worried about the Brake Buddy draining the battery on a one day tow. If I towed for two or more days, I would just let the engine idle for ten minutes or so first thing in the morning to top off the battery.
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2016 Winnebago Journey 40R
2018 Rubicon
1982 FJ40 Toyota Land Cruiser
2020 Keystone Outback 327CG
2020 Dodge Ram 2500
Polaris RZR XP 1000
4 Cats
3 Dogs
1 Bottle of Jack Daniels
Two old hippies still trying to find ourselves!
15 REPLIES 15

sch911
Explorer
Explorer
Yes. Otherwise the Brake Buddy will eventually kill the JL's battery. I reccommend simply connecting the charge line in the 7 way connector.
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