ACC Switch - What does it do?
Elite HDF Member
Joined: Oct 2006
Posts: 4,704
Likes: 3
From:
RE: ACC Switch - What does it do?
The brake light connection would be if your using auxiliary brake lights on a tourpak, saddlebag rails, whatever or for a device which triggers the loop in pavement so you could get a green light/turn arrow if you have a problem with your bike activating them. Some of the early design devices made an ultra-high pitched noise that drove neighborhood dogs nuts, so you only wanted to activate them briefly.
ORIGINAL: mrsr71
Please excuse the dumb question but, why would there be a connection for the brakes?
Dan
ORIGINAL: DeathWind
sincethe 4-pin connector under the seat has the following four connections: Gound, Brakes, ACC Switch, and Ignition.
sincethe 4-pin connector under the seat has the following four connections: Gound, Brakes, ACC Switch, and Ignition.
Dan
Novice
Joined: Apr 2007
Posts: 24
Likes: 0
From:
RE: ACC Switch - What does it do?
ORIGINAL: MNPGRider
Thanks for the info, but did you really mean to have two top rights? 
When I first plugged in my Air Zeppelin seat, the plug has just enough slack in the wire to reach. I cut the wire tires on the harness, and found a big bunch of slack wadded up in the wire harness. Retied the harness, and now have a nice amount of "tail" on the plugin, making it much easier to plug and unplug the seat.
ORIGINAL: verwoodspring
Hi.
I connected my GPS to my bike (Ultra), and wanted to use the ACC switch to turn it on/off.
So I thought I would share how I connected it up - in an attempt to be helpful!
First of all the connector is under the seat. There are two very similar connectors under the seat, but they are wired differently. The connector I needed to use was hidden behind the battery.
Buy yourself an adaptor (#70264-94A). This allows you to use the bike socket, while also providing a "spare". It also means you don't have to cut any of the wires on the bike.
The four pins on the plug provide:
1. negative
2. positive (when the ignition is on)
3. positive (when the brake is applied)
4. positive (from the ACC switch).
I then cut one of the sockets off the lead, and wired up my device.
If you look down at the plug, with the flat part of the plug on the bottom, and the shaped bit at the top, it was wired as follows.(but you should really check yours with a power tester to make sure).
1. negative TOP RIGHT
2. positive (when the ignition is on) TOP RIGHT
3. positive (when the brake is applied) BOTTOM RIGHT
4. positive (from the ACC switch). BOTTOM LEFT
Hi.
I connected my GPS to my bike (Ultra), and wanted to use the ACC switch to turn it on/off.
So I thought I would share how I connected it up - in an attempt to be helpful!
First of all the connector is under the seat. There are two very similar connectors under the seat, but they are wired differently. The connector I needed to use was hidden behind the battery.
Buy yourself an adaptor (#70264-94A). This allows you to use the bike socket, while also providing a "spare". It also means you don't have to cut any of the wires on the bike.
The four pins on the plug provide:
1. negative
2. positive (when the ignition is on)
3. positive (when the brake is applied)
4. positive (from the ACC switch).
I then cut one of the sockets off the lead, and wired up my device.
If you look down at the plug, with the flat part of the plug on the bottom, and the shaped bit at the top, it was wired as follows.(but you should really check yours with a power tester to make sure).
1. negative TOP RIGHT
2. positive (when the ignition is on) TOP RIGHT
3. positive (when the brake is applied) BOTTOM RIGHT
4. positive (from the ACC switch). BOTTOM LEFT
When I first plugged in my Air Zeppelin seat, the plug has just enough slack in the wire to reach. I cut the wire tires on the harness, and found a big bunch of slack wadded up in the wire harness. Retied the harness, and now have a nice amount of "tail" on the plugin, making it much easier to plug and unplug the seat.
If you look down at the plug, with the flat part of the plug on the bottom, and the shaped bit at the top, it was wired as follows.(but you should really check yours with a power tester to make sure).
1. negative TOP LEFT
2. positive (when the ignition is on) TOP RIGHT
3. positive (when the brake is applied) BOTTOM RIGHT
4. positive (from the ACC switch). BOTTOM LEFT
Don't forget, there are two sockets which look alike under the seat.... so make sure you use the correct one!
Novice
Joined: Mar 2011
Posts: 17
Likes: 0
Do anyone know if there is a part that connects to the connecter under the seat and has enough length of wire to reach the fairing? Rather than the "cig lighter" outlet, that is?
I'm determined to use the ACC switch for the driving lights, and am a bit nervous about cutting into any wire INSIDE the fairing.
I'm determined to use the ACC switch for the driving lights, and am a bit nervous about cutting into any wire INSIDE the fairing.
Road Captain
Joined: Apr 2009
Posts: 647
Likes: 5
From: Snohomish WA
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
The Best and Worst Harley-Davidson Moves of 2025
Verdad Gallardo
Seasoned HDF Member
Joined: Sep 2007
Posts: 9,205
Likes: 372
From: Central Illinois, Between I-80 and I-74
Do anyone know if there is a part that connects to the connecter under the seat and has enough length of wire to reach the fairing? Rather than the "cig lighter" outlet, that is?
I'm determined to use the ACC switch for the driving lights, and am a bit nervous about cutting into any wire INSIDE the fairing.
I'm determined to use the ACC switch for the driving lights, and am a bit nervous about cutting into any wire INSIDE the fairing.
Stellar HDF Member
Joined: Jul 2009
Posts: 2,010
Likes: 140
From: Albuquerque New Mexico
Plus 1, I have my heated seats connected to it, deutsch connector under the seat in front of the battery compartment on the 09