I wanted to provide some insight on how to install running lights in an effort to give back to the great community here. I studied about 100 different Bonny and Thruxton bikes and determined that I liked the old meets new theme of sport bike lights on the Bonny remake. I wanted to lower the lights off of the centerline of the headlight bucket a la Thruxton and therefore purchased a Thruxton factory turnsignal mounting bracket and black aluminum cover plates from British Customs. Many of the aftermarket suppliers supply the lights I chose but believe only Bellacorse offers them in 3 lead a.k.a. dual filament turn signals and running lights so that is what I chose.
The install is very straight forward. The write up will be in two parts starting with the front:
1. Remove the old turn signals by taking apart the light. You don’t have to remove the bucket to do this but I suggest you use blue painters tape to mask off all surfaces you will have a wrench around to prevent scratching.
2. Once factory front signals are removed, I recommend you cut the connectors off and use them for your new lights…that way you don’t have to cut the harness inside the headlight more than necessary.
3. Purchase shrink tube and connectors and of course solder everything. Radio Shack has the bullet connectors I like but not the shrink tube. You can purchase shrink tubing on eBay incidentally and if you do a fair amount of wiring which I have in the past, order this in some length in different diameters.
4. Have a look at the front light with connectors attached:
5. It is easy to make a mistake on wiring and I had to disassemble the light to figure this out. The black and white stripe lead is ground. The solid black is for the running light and the other lead is for the turn signal. Bellacorse does not ID these wires so this should help you if you choose his lights.
6. OK…this is the biggest help I can provide as I studied the wiring diagram in the service manual in detail. Most know that just about all of the harness runs into the headlight. The ignition switch does as well of course and is 6 lead which is about two more leads than normal…lol. I wanted to find a switching hot to power the front running lights. Note…the low beam headlight lead will not work as it shuts off when the high beam is deployed. I didn’t want to tap into the ignition harness but didn’t have a choice as I did not find an accessory hot that would power the running lights up front. The proper wire is the Brown in no. 2 position in the ignition serial connector. See pics of the tap. You want to create two leads with female connectors on the end as shown below and tap into the Brown wire…one to each turn signal running light which will now be in parallel with the circuit shared with the rear running light which all factory Bonnies have.
Here is a picture and the wiring diagram:
The install is very straight forward. The write up will be in two parts starting with the front:
1. Remove the old turn signals by taking apart the light. You don’t have to remove the bucket to do this but I suggest you use blue painters tape to mask off all surfaces you will have a wrench around to prevent scratching.
2. Once factory front signals are removed, I recommend you cut the connectors off and use them for your new lights…that way you don’t have to cut the harness inside the headlight more than necessary.
3. Purchase shrink tube and connectors and of course solder everything. Radio Shack has the bullet connectors I like but not the shrink tube. You can purchase shrink tubing on eBay incidentally and if you do a fair amount of wiring which I have in the past, order this in some length in different diameters.
4. Have a look at the front light with connectors attached:

5. It is easy to make a mistake on wiring and I had to disassemble the light to figure this out. The black and white stripe lead is ground. The solid black is for the running light and the other lead is for the turn signal. Bellacorse does not ID these wires so this should help you if you choose his lights.
6. OK…this is the biggest help I can provide as I studied the wiring diagram in the service manual in detail. Most know that just about all of the harness runs into the headlight. The ignition switch does as well of course and is 6 lead which is about two more leads than normal…lol. I wanted to find a switching hot to power the front running lights. Note…the low beam headlight lead will not work as it shuts off when the high beam is deployed. I didn’t want to tap into the ignition harness but didn’t have a choice as I did not find an accessory hot that would power the running lights up front. The proper wire is the Brown in no. 2 position in the ignition serial connector. See pics of the tap. You want to create two leads with female connectors on the end as shown below and tap into the Brown wire…one to each turn signal running light which will now be in parallel with the circuit shared with the rear running light which all factory Bonnies have.
Here is a picture and the wiring diagram:

