Wiring and installation steps for the Mini Turn Signal & Dimmer Switch Coupler-On Kit (SR400 '03-'08)
Installation instructions for the Mini Turn Signal Switch / Dimmer Switch Harness Kit for SR400 ('03-'08). Shows the pin numbers and roles of the two couplers (6-pin and 3-pin) and the connections to each switch, with diagrams.
- 6-pin and 3-pin coupler pin numbers and the role of each pin
- Connections to the dimmer switch and mini turn signal switch
- Preventing stray wire strands and handling the ground wire
The Mini Turn Signal & Dimmer Switch Coupler-On Kit is a harness kit that connects to the bike-side couplers of the SR400 ('03-'08) for installing a mini turn signal switch and a dimmer switch (headlight Hi/Low).
This page explains the pin layout and roles of the two couplers, the connection diagram on the switch side, and points to note when securing the wiring.
01 Preparing the harness
Cut the harness to the length you like. Strip the insulation, insert each wire into the matching position on the switch (see the connection diagram below), and secure it with the screw.
02 Coupler pin numbers
| Pin No. | Function |
|---|---|
| 1 | Headlight Low |
| 2 | Horn |
| 3 | Headlight Hi |
| 4 | Positive power (FREE) |
| 5 | Ground |
| 6 | Headlight positive power |
| 7 | R turn signal |
| 8 | L turn signal |
| 9 | Turn signal relay |
03 Connecting to the switches
Connect each pin of the two couplers to the corresponding terminals on the dimmer switch (top right of the diagram) and the mini turn signal switch (bottom right of the diagram) as shown.
04 Key wiring points
Strip a longer length of insulation from the ground wire, and clamp the wire itself to the handlebar together with the switch cover.
Exposed wire strands can cause malfunctions, so trim the wires so no strands stick out from the screw terminal.
After connecting, be sure to check that the headlight Hi/Low, horn and left/right turn signals all work correctly. If you are unsure about installing it yourself, please have the work done by someone with the proper knowledge or by a custom shop. If you have any questions, please contact us via our contact form.
Products covered in this article
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Wiring and installation steps for the Mini Turn Signal & Dimmer Switch Coupler-On Kit (SR400/500 '85-'00)
Wiring diagram for the Coupler-On Harness for Mini Turn Signal Switch (SR400/500 '85-'00)
Wiring Diagram for the Plug-and-Play Harness Set for Speedometer Lighting with Indicators (SR400 '93-'02/500)
*Installation is at your own risk. If you're unsure about doing the work yourself, we recommend consulting your local motorcycle shop.
*The content and photos reflect the time of writing. Please check each product page for current specifications, fitment and stock.