online wiring diagram

I have an ST955 that lost ground on the starter relay switch. when I grounded the black and white wire on the switch the horn became wierd. Now the horn only works when the clutch lever is actuated. Is black and white Triumph's frame ground or have I tapped into some sort of safety lockout on the relay ground circuit. I am visual so I prefer a factory wiring diagram that I can consult online or that one of you devote's would fax to me in Houston. The unit will rot on the showroom unless the electrics are functional. Help

[unummyu]

According to my 2003 ST wiring diagram: +12 volts comes from pin 2 of connector 34 (alarm connector) on a black wire to the starter button through an unmarked connector on the right side handlebar switch assembly on pin 12. From the starter switch a white and red wire is attached to pin 11 on that unmarked connector. That wire goes to the headlight cut out relay and to the starter solenoid.

The ground side of the starter solenoid is connected with a black and pink wire that connects through the clutch lever switch. Interestingly, that same ground line source (black and yellow in the handlebar connector) is connected to the horn button as well. It sounds like your problem may be in the ground line on the handlebar switch. Check pin 8 on the connector going to the clutch switch and horn button. It should be connected directly to ground. If not run a new line from the battery or another known good ground to pin 8 or bypass the connector and make the splice on the other side of the connector to the black/yellow wires directly.

The starter solenoid switches the (brown?) wire connected directly to the positive post on the battery with the black and white wire connected to the starter motor. The starter motor is of course grounded on the other side with a black wire.

So to answer your question, no the black and white line is not chassis ground directly at least on the diagram I have. It would appear as a ground though, through the starter motor with only a few ohms resistance to ground (if that is the only blk/wht wire in the harness).

[unummyu]

After rereading the original post and putting my glasses on I think I found what you are looking for. There is another black/white wire in the left handlebar connector. I drew a diagram of the 2003 SprintST connector. Are you sure the wire you connected to ground was black/white and not black/pink? If the black/white wire were grounded the horn should be on constantly when the ignition is on. From the wiring diagram it would make sense that the horn would not work unless the clutch switch were engaged if the black/pink wire were grounded. The black wire that should supply the ground on pin 8 may still be broken. If that is the case then the horn is getting the ground through the clutch lever switch. I would also bet that the bike would now start without the clutch being pulled in too if the black/pink wire is grounded?

Actually the wire labeled to starter solenoid should be labeled to starter SWITCH. :wink:


[img]C:\JAWS\Triumph\handlebar switch.jpg[/img]

[ This message was edited by: unummyu on 2005-08-25 05:32 ]

I shall procede with the information you supplied. Apparently the handlebar switch frame ground has been interrupted by Lucas gremlins or yank interference. G'day!