Spare Parts to Keep on Hand?

[jebiruph]

Bypasses some of the electrical stuff so both batteries can get a charge during jump starting.

These are instructions to jumpstart using only the main or only the aux battery. The 2018 Wrangler needed the jumper to start with just the main battery.

The jumper connects the main battery directly to system electronics, bypassing the ESS relay and the ESS High Current Fuse and can be useful if either of those or the aux battery goes bad.

A 30 amp fuse worked for me, others needed a 40 amp.

https://www.jlwranglerforums.com/forum/threads/3-6l-ess-dual-battery-consolidated-information.25377/

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