Year of bike and wiring harness

[SCOTTSEY]

I have a 1977 xs650 serial number ending in70-4442
I ordered a new wiring harness and once I started installing I notices a few differences.
My safety relay has a L/B wire out of it which is more inline with the SE model (totally different vin number),new harness has no L/B wire.
Second difference is plug to the cancelling unit
New harness has six wires a W/R is present but not on cancelling unit. The 650D and SE do not have a 6th wire.
My thoughts are at a loss wether I have the wrong harness or who knows
Any ideas out there?

 

[Wagner73]

What you have described i.e. no L/B wire on the safety relay and the cancelling unit only having 5 wires (and no W/R wire) is correct for a 650D. The 650E harness/cancelling unit was the same as the D, BUT the safety relay was changed and added the L/B wire; the change enabled automatic headlight control i.e. removed control from the bar switch.

And I can't find a diagram that shows a 6-wire cancelling unit...the connector is a 6-pin, one pin is blank.

 

[Wagner73]

Something else occurred to me. The 650E was the last version with the simpler 3-wire light checker...the 650SE moved to the 6-wire version. You might want to have a look at that to help you narrow it down.

 

[SCOTTSEY]

What you have described i.e. no L/B wire on the safety relay and the cancelling unit only having 5 wires (and no W/R wire) is correct for a 650D. The 650E harness/cancelling unit was the same as the D, BUT the safety relay was changed and added the L/B wire; the change enabled automatic headlight control i.e. removed control from the bar switch.

And I can't find a diagram that shows a 6-wire cancelling unit...the connector is a 6-pin, one pin is blank.

Thanks for your reply. One is blank on the new harness side on cancelling unit side there are 6 wires odd wire is W/R.
Also been chatting with Mike's xs where I purchased the new harness.
I have the old harness which was abused by the previous owner but it’s an option to put back if required.

 

[vexsed]

Did you resolve your problem?
My 77, like yours, according to MikesXS, being above production nr 704000, should require harness #24-6575 (those 704000 and below requiring harness #24-6574)
Is this the harness you bought? I ask because I also have a 3 wire Safety Relay and 5 wire Turn Cancelling Unit and am considering the pros and cons of sourcing or making a harness.

 

[SCOTTSEY]

What you have described i.e. no L/B wire on the safety relay and the cancelling unit only having 5 wires (and no W/R wire) is correct for a 650D. The 650E harness/cancelling unit was the same as the D, BUT the safety relay was changed and added the L/B wire; the change enabled automatic headlight control i.e. removed control from the bar switch.

And I can't find a diagram that shows a 6-wire cancelling unit...the connector is a 6-pin, one pin is blank.

Thanks for your help Wagner. I have the 6 wire on the bike side not the new harness of the cancelling unit ,as for work on the xs I’m tailing off for winter as I don’t yet have heat installed in the garage
But good things to come.
My hanes
Manual only has 5 wires also

 

[650Skull]

Did you resolve your problem?
My 77, like yours, according to MikesXS, being above production nr 704000, should require harness #24-6575 (those 704000 and below requiring harness #24-6574)
Is this the harness you bought? I ask because I also have a 3 wire Safety Relay and 5 wire Turn Cancelling Unit and am considering the pros and cons of sourcing or making a harness.

Change in the harness #'s would be the removal of the brake lining warning light system mid way through the 77 production year

 

[SCOTTSEY]

Did you resolve your problem?
My 77, like yours, according to MikesXS, being above production nr 704000, should require harness #24-6575 (those 704000 and below requiring harness #24-6574)
Is this the harness you bought? I ask because I also have a 3 wire Safety Relay and 5 wire Turn Cancelling Unit and am considering the pros and cons of sourcing or making a harness.

I need to check for you tomorrow on the number but it was the recommended harness from MikesXs
Sorry for the late reply

 

[SCOTTSEY]

Does this help

 

[5twins]

If your '77 is a Canadian model then yes, it would have a L/B wire coming out of the safety relay. There is a '77 Canadian wiring diagram available on-line.



I suppose it's possible that a replacement '77 Canadian wiring harness is not available.

 

[SCOTTSEY]

If your '77 is a Canadian model then yes, it would have a L/B wire coming out of the safety relay. There is a '77 Canadian wiring diagram available on-line.

View attachment 361703

I suppose it's possible that a replacement '77 Canadian wiring harness is not available.

Bonus ! And thank you ! That’s the ticket

 

[Wagner73]

If your '77 is a Canadian model then yes, it would have a L/B wire coming out of the safety relay...

Completely correct...as usual! I guess the L/B wire and automatic light control hit the Canadian models one year before the US.