timn1984
Well-Known Member
- First Name
- Tim
- Joined
- Oct 12, 2018
- Threads
- 16
- Messages
- 808
- Reaction score
- 807
- Location
- Louisville, KY
- Vehicle(s)
- Jeep Wrangler Unlimited 2018 JL Sahara,Dodge Journey 2012, Toyota Camry 2015
- Occupation
- Yes
- Vehicle Showcase
- 1
You are a good man. You need to find a Day Job! Thanks for the research..... Job well done.Aux Battery Bypass (PCR Bypass)
(updated 03/24/2019)
To accommodate the dual battery ESS system, the JL electronics have been separated into Aux powered systems and Main powered systems. The PCR (power control relay) is used to connect and disconnect the systems as needed. A bad or discharged aux battery can affect the operation of the PCR, disrupting both the operation of the electronics and the starting procedure.
Using a jumper to bypass the PCR or unplugging it may restore the ability to start. The jumper is installed between PDC terminals N1 (aux systems) and N2 (main systems) and directly connects the two systems, effectively bypassing the PCR. Unplugging the PCR (disabling it) keeps the main and aux systems always connected, but this will not work with a bad PCR or a blown PCR fuse.
Here's what using a jumper looks like, and it's discussed in this htread.
https://www.jlwranglerforums.com/forum/threads/3-6l-ess-aux-battery-bypass.17293/
The PCR is located behind the front passenger side tire, and it is discussed in the thread. (See posts 75, 92, 93)
https://www.jlwranglerforums.com/forum/threads/3-6l-ess-battery-diagram.14401/
View attachment 158893
Reading Individual Battery Voltage
(updated 04/13/2019)
Since the batteries are usually connected in parallel, following is how to electrically isolated them to check the individual battery voltage. Keep in mind that the best way to check the condition of a battery is load testing it, which is covered in this thread.
https://www.jlwranglerforums.com/forum/threads/3-6l-ess-battery-basic-load-testing.22031/
There are two cables connected to the Main battery negative terminal, one is from the Aux battery negative terminal and the other is to the body ground. Disconnecting the Aux battery negative cable from the Main battery negative terminal will isolate the batteries to facilitate reading the voltage of the individual batteries.
Here's reading the aux battery voltage - Main positive terminal to Aux battery ground.
Here's reading the main battery voltage - Main positive terminal to Main battery ground.
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