The Honda 12v Accessory Socket Kit 08U70-K2E-J00 (available from WeBike) is a nice quality factory part but the USA Trail 125’s do not have the mating connector to support it. The 12v power (both switched and continuous) and ground are in the headlight bucket but I did not want to alter the harness in any way. One solution is to buy the appropriate mating connectors and make short extension harnesses, allowing you to tap into the needed sources. The switched 12v is perfect for the Acc Socket, and the constant 12v is perfect for a Deltran Battery Tender SAE connector for battery maintenance.
The ignition switch connector has three wires, one of which is continuous 12v and one is switched 12v. The ground wire you’ll find on either of the turn signal connectors. I used 6” wires to make the harnesses, though if I made a second set I might try reducing that to 5”. The connector pins are too small to accommodate more than one wire, so I removed 1/2” of insulation from the center of the wire and soldered and heat shrink insulated my tap wires. Since I was adding both an SAE port and the switched socket I needed 2 tap wires on my turn signal ground, and one tap wire on each of the switched and unswitched power wires.
I found the connectors at Corsa-Technic, excellent service - I ordered on Monday and USPS delivered them Thursday. Here are their part numbers (perhaps an industry standard?): The 08U70-K2E-J00 Acc Socket has an HM-2P on it, so it goes into an HM-2S. The ignition switch uses an 250.LOC-3P on the harness side and a 250.LOC-3S on the switch side, and the turn signal uses HC050-2P on the harness side and HC050-2S on the turn signal side. I used an extra HM-2S and HM-2P for my SAE port. I also bought some 18ga wire (for the Turn Signal harness, both green and orange) and some 16ga wire (for the Ignition Switch harness, black) from them, along with some excellent doublewall heat shrink.
Which wires do you need?: The ground wire is green, available on either of the two turn signal connectors. One of the three wires to the ignition switch is pink/black, that is the wire you DO NOT want. The other two are the switched 12v and the unswitched 12v.
Space in the headlight bucket is tight, but it does all fit. Certainly not the cheapest or fastest solution, but the quality of the Honda socket is excellent, the fit of the socket is perfect, and the wiring harness remains unscathed. Glad to answer any questions if this is of use to anyone.
The ignition switch connector has three wires, one of which is continuous 12v and one is switched 12v. The ground wire you’ll find on either of the turn signal connectors. I used 6” wires to make the harnesses, though if I made a second set I might try reducing that to 5”. The connector pins are too small to accommodate more than one wire, so I removed 1/2” of insulation from the center of the wire and soldered and heat shrink insulated my tap wires. Since I was adding both an SAE port and the switched socket I needed 2 tap wires on my turn signal ground, and one tap wire on each of the switched and unswitched power wires.
I found the connectors at Corsa-Technic, excellent service - I ordered on Monday and USPS delivered them Thursday. Here are their part numbers (perhaps an industry standard?): The 08U70-K2E-J00 Acc Socket has an HM-2P on it, so it goes into an HM-2S. The ignition switch uses an 250.LOC-3P on the harness side and a 250.LOC-3S on the switch side, and the turn signal uses HC050-2P on the harness side and HC050-2S on the turn signal side. I used an extra HM-2S and HM-2P for my SAE port. I also bought some 18ga wire (for the Turn Signal harness, both green and orange) and some 16ga wire (for the Ignition Switch harness, black) from them, along with some excellent doublewall heat shrink.
Which wires do you need?: The ground wire is green, available on either of the two turn signal connectors. One of the three wires to the ignition switch is pink/black, that is the wire you DO NOT want. The other two are the switched 12v and the unswitched 12v.
Space in the headlight bucket is tight, but it does all fit. Certainly not the cheapest or fastest solution, but the quality of the Honda socket is excellent, the fit of the socket is perfect, and the wiring harness remains unscathed. Glad to answer any questions if this is of use to anyone.
