2018 Fat Boy Aux Electrical Harness
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6th Gear
Joined: Jun 2018
Posts: 10
Likes: 1
From: Indianapolis
2018 Fat Boy Aux Electrical Harness
I purchased the Harley garage door opener and wiring harness for my 2018 114" Fat Boy. The instructions are terrible and are less then informative. Does anyone know if there is an auxiliary plug on the fat boy that can be used for power? Some bikes have a switchable plug, others are unswitched that people use for LEDs or heated grips etc... Also, it there a harness under the seat or side covers that contains a wire for the high beam headlight? I would prefer this option vs tap in and run things under the tank. I just order the service manual so hopefully this will shed some light on the subject.
Have any of you installed this opener on a 2018 Fat Boy or softail model? I assume the harnesses would be similar across the 2018 softail models...
Have any of you installed this opener on a 2018 Fat Boy or softail model? I assume the harnesses would be similar across the 2018 softail models...
Road Warrior
Joined: May 2018
Posts: 1,561
Likes: 443
From: PNW
Connector 325B, mounted under the left side cover is labeled "P&A Accessory" in the service manual. It comes straight off the BCM, Pin M2, labeled Accessory Power. This is in Figure A-4 of the service manual, titled "Ignition and Power Accessory Distribution". It's described as a 3-way Molex but I cannot find a picture of the connector itself. P&A in the glossary is defined as Power and Accessories. Seems a likely candidate for what you're thinking of doing.
I don't know if it is relayed, and I cannot seem to find any information about integrated relays in the manual. But I just got my manual yesterday and haven't finished going through it. I'm going to pick up the electrical diagnostic manual when I can, in the meantime just have to rely on what appears to be somewhat general information about the electrical system.
Oh, and there is also the USB socket on the left frame neck. This may suit this purpose even better depending on what voltage the opener requires. It ties into that same pin of the BCM.
I don't know if it is relayed, and I cannot seem to find any information about integrated relays in the manual. But I just got my manual yesterday and haven't finished going through it. I'm going to pick up the electrical diagnostic manual when I can, in the meantime just have to rely on what appears to be somewhat general information about the electrical system.
Oh, and there is also the USB socket on the left frame neck. This may suit this purpose even better depending on what voltage the opener requires. It ties into that same pin of the BCM.
Last edited by iHodor; Jul 18, 2018 at 03:32 PM.
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6th Gear
Joined: Jun 2018
Posts: 10
Likes: 1
From: Indianapolis
Thanks iHoder! I will look for that plug as I believe the harness I purchased my plug into it. The opener requires 12v so I don’t know if the USB port won’t work. Also, the opener is triggered off the high beam. I will look through the manual to see if the high beam wire runs from a harness under the seat. Flash the high beam light and the included transmitter sends an open signal to the receiver in the garage. It will be a slick little bugger if I can get it to actually work.
Road Warrior
Joined: May 2018
Posts: 1,561
Likes: 443
From: PNW
You're very welcome. I hope you can report back on what you find.
Something which has me very curious is that the basic schematic shows the P&A, the USB, the DLC (Data Link Connector), AND the headlamp all drawing juice from the same BCM pin. Now given that USB voltage is typically 5 volts, unless something is happening that is not shown on that diagram, the headlamp and the P&A connector will also be using 5 volts. That would seem very strange to me given that 12v has in the past been the typical accessory voltage provided. I wish I had the electrical diagnostic manual to investigate further.
Something which has me very curious is that the basic schematic shows the P&A, the USB, the DLC (Data Link Connector), AND the headlamp all drawing juice from the same BCM pin. Now given that USB voltage is typically 5 volts, unless something is happening that is not shown on that diagram, the headlamp and the P&A connector will also be using 5 volts. That would seem very strange to me given that 12v has in the past been the typical accessory voltage provided. I wish I had the electrical diagnostic manual to investigate further.
Thread Starter
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6th Gear
Joined: Jun 2018
Posts: 10
Likes: 1
From: Indianapolis
Got it!
I plugged my harness into 325b. That harness had a couple other aux plugs that I doubt I will use so I just tucked them under the seat. The harness pulls power and ground off 325b. I cut the wires to a reasonable length and ran them to the transmitter. I used Velcro to mount the transmitter behind the the right side cover in front of the battery.
I managed to find the blue wire with white tracer in a large harness under the seat. I was thrilled about this because I didn’t have to lift the tank to run the trigger wire. On the 2018 Softail, the blue wire with the white tracer is for the headlight high beam. The instructions call for using this as a trigger so this is what I used. All wires were soldered, double heat shrinked and tie wrapped into position. I will most likely go back and use black cloth tape to wrap all of the wires so they look factory. No real need to do this other than my OCD issues...
Now that I have done this, I can tell you it was quite easy, just time consuming. It works as advertised and opens my garage door from several houses away.
Thank you again iHoder, I couldn’t have started this without your advise.
I plugged my harness into 325b. That harness had a couple other aux plugs that I doubt I will use so I just tucked them under the seat. The harness pulls power and ground off 325b. I cut the wires to a reasonable length and ran them to the transmitter. I used Velcro to mount the transmitter behind the the right side cover in front of the battery.
I managed to find the blue wire with white tracer in a large harness under the seat. I was thrilled about this because I didn’t have to lift the tank to run the trigger wire. On the 2018 Softail, the blue wire with the white tracer is for the headlight high beam. The instructions call for using this as a trigger so this is what I used. All wires were soldered, double heat shrinked and tie wrapped into position. I will most likely go back and use black cloth tape to wrap all of the wires so they look factory. No real need to do this other than my OCD issues...
Now that I have done this, I can tell you it was quite easy, just time consuming. It works as advertised and opens my garage door from several houses away.
Thank you again iHoder, I couldn’t have started this without your advise.
Road Warrior
Joined: May 2018
Posts: 1,561
Likes: 443
From: PNW
Sounds like you wired it up just as it should be. I've been struggling to find a place to mount one of my small garage door openers, and thought I had a good place inside the headlight nacelle. But apparently my openers have a pretty weak signal because the metal nacelle blocks the signal. For now I'll be keeping the opener in my right jacket pocket. But your setup sounds much nicer. Glad it worked out for you.
BTW, your bike looks great!
BTW, your bike looks great!
Tourer
Joined: Sep 2010
Posts: 269
Likes: 101
From: Southern Ont, Canada
Got it!
I plugged my harness into 325b. That harness had a couple other aux plugs that I doubt I will use so I just tucked them under the seat. The harness pulls power and ground off 325b. I cut the wires to a reasonable length and ran them to the transmitter. I used Velcro to mount the transmitter behind the the right side cover in front of the battery.
I managed to find the blue wire with white tracer in a large harness under the seat. I was thrilled about this because I didnt have to lift the tank to run the trigger wire. On the 2018 Softail, the blue wire with the white tracer is for the headlight high beam. The instructions call for using this as a trigger so this is what I used. All wires were soldered, double heat shrinked and tie wrapped into position. I will most likely go back and use black cloth tape to wrap all of the wires so they look factory. No real need to do this other than my OCD issues...
Now that I have done this, I can tell you it was quite easy, just time consuming. It works as advertised and opens my garage door from several houses away.
Thank you again iHoder, I couldnt have started this without your advise.
I plugged my harness into 325b. That harness had a couple other aux plugs that I doubt I will use so I just tucked them under the seat. The harness pulls power and ground off 325b. I cut the wires to a reasonable length and ran them to the transmitter. I used Velcro to mount the transmitter behind the the right side cover in front of the battery.
I managed to find the blue wire with white tracer in a large harness under the seat. I was thrilled about this because I didnt have to lift the tank to run the trigger wire. On the 2018 Softail, the blue wire with the white tracer is for the headlight high beam. The instructions call for using this as a trigger so this is what I used. All wires were soldered, double heat shrinked and tie wrapped into position. I will most likely go back and use black cloth tape to wrap all of the wires so they look factory. No real need to do this other than my OCD issues...
Now that I have done this, I can tell you it was quite easy, just time consuming. It works as advertised and opens my garage door from several houses away.
Thank you again iHoder, I couldnt have started this without your advise.
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Road Warrior
Joined: May 2018
Posts: 1,561
Likes: 443
From: PNW
Update on my solution. I ended up having to replace my garage door openers and the new remotes have a much better range than the old. So I used velcro to mount one of them on the backside of my headlight nacelle, on the right. My bike never sees water so it works great, though I only use it once I've stopped the bike, and usually after dismounting.
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