ACC and B+ CONNECTORS

E

erinl

New member
Over the weekend I was building 12 Volt Power Modules for some HDForums members and naturally two common questions came up. "Do you plan to use the ACC switch on your dash to turn the Module On/Off?" or "are you wiring to the B+ connector (hot) and intend on using an On/Off power switch on the Module itself?" Regardless of what accessory you personally may need to wire, now or in the future both are viable options to power your accessories. For clarification, there are a total of 2 accessory plugs, for those who are unaware. One plug operates off the ACC switch on your dash and the other plug is wired to the B+ connection (hot) and is not operated by a switch. The difference between the two is that the ACC switch will only operate when the ignition is turned on. The other is wired hot and remains on, even when the ignition is turned off.

While at my local HD dealer over the weekend, I purchased two wiring harness adapters and took photos to show you how they work. For your reference they are:

P/N 70270-04 ACCESSORY ADAPTER HARNESS (B+ CONNECTION)
P/N 70264-94A TWO-INTO-ONE WIRING HARNESS ADAPTER (ACC SWITCH)

From the factory as originally equipped your bike (Touring models) has one B+ plug and one ACC plug. However if you purchase either of the two adpaters mentioned above, you can expand your plugs to add more accessories (as shown in the photos).

Picture 1 (0374.jpeg) shows both accessory plugs, the ACC (grey/green) and the B+ (grey). Also pictured is the wiring harness & plug (orange) for my 12 volt Power Module which is controlled by the ACC switch.

Picture 2 (0375.jpeg) shows P/N 70264-94A which expands the one ACC plug to a total of two. This will operate two accessories off the same ACC switch located on your dash.

Picture 3 (0376.jpeg) shows P/N 70270-04 which expands the one B+ plug to a total of three. Since this is a hot circuit that doesn't turn off with your ignition, you need a power switch on whatever accessory you may be using.

Picture 4 (0377.jpeg) shows both adapters plugged in which expands your plugs to a total of five (2 ACC & 3 B+).

Thought I'd share this information since some of you may already be using both plugs and/or were unaware that adapters were available. Hope you found this useful.
 
Great info and thanks for taking the time to illustrate. If I were going to install led accent lights, would I use either plugs or could I use the front switch on my RK nacelle?
 
I understand the acc plug and have used it with the expansion connector.
I recently had heated grips installed. I was told that they used the B+ connector. I don't need to use the acc switch but the grips turn off with the ignition. What's different about this situation compared to the one you describe?
 
Well...you could wire to either. It depends on specifically what LED lamps you planned on using. For example, the LED accent lights (p/n 54332-04) which provides lighting for your Tourpack and Saddlebags would wire to the B+ plug. Reason is, you want to be able to turn them on/off without having to turn the ignition on each time. Same would go for the LED pods that illuminate your engine. Those operate off seperate switches anyway, so they do not need to run off the ACC circuit. Having said that, if you wanted to use the Saddleguard Glo-lights or Driver Footboard LED lighting, those would run off the ACC plug, which is controlled by the ACC/AUX switch on your Road King.

All depends on what you are wiring.
 
Not sure how your grips are wired. Since they are turned on/off at the grip and they don't require the ACC switch to be on, then they are probably wired to the ignition circuit. That's all I can think of.
 
Very good information. Much appreciated. Thanks for taking the time to post, and for the pictures. Very helpful.
 
Excellent write-up and pics.

Some additional information on the use of the ACC connector: both the HD Tour Pak spoiler LED and saddlebag spoiler LED's use the ACC connector.

Thanks, again, for a very useful post.
 
Nice thread. Just to add that older bikes like my '03 RKC don't have the B+ connector for always on juice, this was added sometime later. So anyone w/ older bikes, wouldn't want them freakin out if they don't see the plug. Matter of fact, if I remember reading it right in the instructions that came w/ the fog light kit, I think it is 03 and earlier that don't have the plug, if that is correct, then '04 and later should have it...

But I am using the accessory connector and got that splitter for a future project.
 
Dude, call me simple minded but that's some of the best info I've seen on the board to date.

Thanks for posting this and good explanations! This is like that "Manswers" show without the boobs! Hmmmmm, throw in some boobs and you could be on TV!
 
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