Need wiring diagram or info: 08 JK Brakelights - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 4 Old 04-08-2019, 01:29 PM Thread Starter
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Need wiring diagram or info: 08 JK Brakelights

I just pulled off the connector to my brake light switch, for my 2008 JK 'X'. There seem to be 6 wires in this connector, four of which seem to be unnecessary to this old-school tech. I'm trying to identify the 'always hot' wire from the fuse box. I think it might be the green wire with red stripe, second from the end. It would really make me happier if I could confirm this hunch before I mess something up. If you know for sure which is the hot wire, or if you have access to a 2008 Wrangler JK wiring diagram for this area, I would be very grateful.

For the curious, I'm planning to use two isolation diodes to tap a second "always hot" source to this wire, so that when I have my battery disconnect switch open, the brake lights will still be activated when the RViBrake presses on the pedal during towing.
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post #2 of 4 Old 04-08-2019, 02:14 PM
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Check the pin you think may be always hot with a volt meter.
First with the ignition off, then after you pull fuse M1.

There's a good chance if you tap power to that wire, only the third brake light will come on.
Let us know how it works out.

2008 Unlimited Rubicon Automatic

Last edited by ronjenx; 04-08-2019 at 02:18 PM.
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post #3 of 4 Old 04-08-2019, 07:28 PM Thread Starter
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Initial testing says all three brake lights will come on. However I haven't actually made the final connections, because I won't have the diodes until Wednesday or Thursday.
Theory is that when I apply the RV brakes, the two corner brake lights will always come on. If deceleration causes the RViBrake to activate, then all three brake lights should come one. Likewise if using the exhaust brake on the RV causes enough decel to trigger the RViBrake, then all three brake lights should come on. But if it's only the two corner ones, I'll be okay with that.
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post #4 of 4 Old 04-08-2019, 07:47 PM
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Here you go. I think you'll want to look at 8W-35-5... Need anything else?




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Last edited by rockystock; 04-08-2019 at 08:00 PM.
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