Wiring and installation steps for the Mini Turn Signal & Dimmer Switch Coupler-On Kit (SR400/500 '85-'00)
Wiring diagram for the Mini Turn Signal & Dimmer Switch Coupler-On Harness for SR400/500 ('85-'00). Shows the coupler pin numbers and roles, the connections to each switch, and key wiring points, with diagrams.
- 9-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 that plugs directly into the bike-side coupler of the SR400/500 ('85-'00) for installing a mini turn signal switch and a dimmer switch (headlight Hi/Low).
This page explains the coupler pin layout and roles, 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 | Turn signal relay |
| 5 | Ground |
| 6 | R turn signal |
| 7 | L turn signal |
| 8 | Positive power (FREE) |
| 9 | Headlight positive power |
03 Connecting to the switches
Connect each coupler pin to the corresponding terminals on the dimmer switch (round switch at top right of the diagram) and the mini turn signal switch (bottom of the diagram) as shown.
04 Key wiring points
Exposed wire strands can cause malfunctions, so trim the wires so no strands stick out from the screw terminal.
Strip a longer length of insulation from the ground wire, and clamp the wire itself to the handlebar together with the switch cover.
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.
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*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.