Assuming you connected this "charge line" directly to the positive side of the toad battery and not somewhere in the fuse box, this issue probably has more to do with the tail/brake light wiring than the charge wiring.
BTW, putting a diode inline in the "charging line" puts another .6 VDC voltage drop between the RV and toad batteries making charging even less effective when coupled with the voltage drop due to the long charging wire's resistance.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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