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Jeep Wrangler YJ
YJ General Discussion
Awesome Hood Light Setup
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<blockquote data-quote="machoheadgames" data-source="post: 433935" data-attributes="member: 18789"><p>It helps to first know how the parking brake circuit goes....basically the bulb's ground goes to 3 locations...the brake warning switch on the proportion/combo valve, then further upstream to the parking brake, and then to the ignition switch. The ignition switch grounds the circuit on start mode, the parking brake obviously when it's set, and the brake warning switch when you get air in the brakes.</p><p></p><p>so that circuit starts at the ignition switch, splices into two wires for a branch to go to the parking brake, and then the final leg goes out the firewall bulkhead connector, to the brake switch, and back into the cab through the bulkhead and to the instrument cluster.</p><p></p><p>So that brake warning switch comes out of the main large firewall loom that runs across the top from the battery to the bulkhead. I fished my wire through the big loom and over to the brake warning loom, and will splice it into the white/black wire there. You could splice it into the gray wire but then if you had air in the brakes you it would start to trigger your relay on the road.</p><p></p><p>Since it is the bulb you are grounding, technically the flow is from the bulb to the brake warning switch, through that switch, and then out to the other two. So the white/black wire is AFTER the brake warning switch. I will put the diode on the white/black wire with the stripe facing away from the brake warning switch just to make sure no feedback from my relay travels up that wire and messes with the bulb in the dash.</p><p></p><p>I had relays in the past on my truck tied to the brake and when I would set it, I would get weird flickering in the dash, so installing diodes has been my solution. I don't know if I will need it but I'm not going to wait to find out.</p><p></p><p>Here's a screenshot and some pics to make it make more sense. It's really quite simple. You can skip the diode most likely, I just choose to add it because I don't want to deal with any reworking again. I've edited this project enough.</p><p></p><p>[ATTACH=full]119325[/ATTACH]</p><p></p><p>[ATTACH=full]119329[/ATTACH]</p><p></p><p>[ATTACH=full]119330[/ATTACH]</p></blockquote><p></p>
[QUOTE="machoheadgames, post: 433935, member: 18789"] It helps to first know how the parking brake circuit goes....basically the bulb's ground goes to 3 locations...the brake warning switch on the proportion/combo valve, then further upstream to the parking brake, and then to the ignition switch. The ignition switch grounds the circuit on start mode, the parking brake obviously when it's set, and the brake warning switch when you get air in the brakes. so that circuit starts at the ignition switch, splices into two wires for a branch to go to the parking brake, and then the final leg goes out the firewall bulkhead connector, to the brake switch, and back into the cab through the bulkhead and to the instrument cluster. So that brake warning switch comes out of the main large firewall loom that runs across the top from the battery to the bulkhead. I fished my wire through the big loom and over to the brake warning loom, and will splice it into the white/black wire there. You could splice it into the gray wire but then if you had air in the brakes you it would start to trigger your relay on the road. Since it is the bulb you are grounding, technically the flow is from the bulb to the brake warning switch, through that switch, and then out to the other two. So the white/black wire is AFTER the brake warning switch. I will put the diode on the white/black wire with the stripe facing away from the brake warning switch just to make sure no feedback from my relay travels up that wire and messes with the bulb in the dash. I had relays in the past on my truck tied to the brake and when I would set it, I would get weird flickering in the dash, so installing diodes has been my solution. I don't know if I will need it but I'm not going to wait to find out. Here's a screenshot and some pics to make it make more sense. It's really quite simple. You can skip the diode most likely, I just choose to add it because I don't want to deal with any reworking again. I've edited this project enough. [ATTACH type="full" alt="4CC5400F-8118-4E0E-AC7E-BCB6B259A4E4_1_201_a.jpeg"]119325[/ATTACH] [ATTACH=full]119329[/ATTACH] [ATTACH=full]119330[/ATTACH] [/QUOTE]
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Jeep Wrangler YJ
YJ General Discussion
Awesome Hood Light Setup
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