1951 fl horn switch wiring

Electrical issues
Forum rules
Please do not start new topics here, but here: New Panhead and Flathead topics
Post Reply
craig60pan
Posts: 181
Joined: Fri Dec 31, 2004 2:37 pm
Bikes: 1960 FL
1951 FL
Location: Atlanta

1951 fl horn switch wiring

#1

Post by craig60pan » Mon Jul 27, 2009 6:19 pm

Getting ready to rewire the handle bars on a 51 FL and am not sure if the horn button should be two wires or one
1) Wiring diagram shows one wire
2) Parts books show one and two wire versions
3) Wire that came out of handle bars was the two wire version but was not wired to a horn, ends were terminated
Anyone know what is right?
Thanks
CJ



Perry Ruiter
Posts: 100
Joined: Mon Jan 26, 2009 9:29 am
Location: Canada

Re: 1951 fl horn switch wiring

#2

Post by Perry Ruiter » Mon Jul 27, 2009 6:53 pm

craig60pan wrote:Getting ready to rewire the handle bars on a 51 FL and am not sure if the horn button should be two wires or one
1) Wiring diagram shows one wire
2) Parts books show one and two wire versions
3) Wire that came out of handle bars was the two wire version but was not wired to a horn, ends were terminated
Anyone know what is right?
Thanks
CJ
CJ - the two wire part of the horn button has a -53 part number, but if you have rubber mounted risers I would recommend using it, even though technically not correct ... Perry

FlatHeadSix
Moderator
Posts: 2685
Joined: Sun Jun 06, 2004 5:14 pm
Bikes: '31 VL, '34 VD, '45 WLA, '47 WL, '49 FL, '51 WL, '58 ST (Hummer), '71 GE (Servi)
Location: Lonoke, Arkansas

Re: 1951 fl horn switch wiring

#3

Post by FlatHeadSix » Mon Jul 27, 2009 7:00 pm

CJ
If you have grounded handlebars (not rubber mounted) then the 1-wire horn button will work fine. The button supplies the ground connection to the horn, the other terminal on the horn should be the hot side which get positive battery voltage from the ignition switch. One side of the button will be grounded to the bars and the wire will then feed ground to the horn.

If you have rubber mounted bars that are insulated from the chassis ground you will need the 2-wire switch. One wire from the button (doesn't matter which one) will be grounded somewhere on the chassis, the other will supply ground to the horn.

good luck

mike

craig60pan
Posts: 181
Joined: Fri Dec 31, 2004 2:37 pm
Bikes: 1960 FL
1951 FL
Location: Atlanta

Re: 1951 fl horn switch wiring

#4

Post by craig60pan » Mon Jul 27, 2009 9:02 pm

Perry, Mike,
Thanks for the quick response. It has the stock risers but I suspect the previous owner went with the two wire version to insure a solid ground.
Seems like the right choice to make. (the fact that I have a two wire replacement horn button has no bearing on my decision) I don't see a ground terminal on the terminal plate so I suspect any solid ground screw will do.
Perry
Are you doing any speedo rebuilds again? Last we talked you were focusing on your own stuff. I might have a candidate if you are. It came off the 51 but I think it is from a 60 police bike.
Looks nice but the trip odometer is bad, not sure if the speedo works as I have not had it running yet, but hopefully will know soon.
CJ
You do not have the required permissions to view the files attached to this post.

Perry Ruiter
Posts: 100
Joined: Mon Jan 26, 2009 9:29 am
Location: Canada

Re: 1951 fl horn switch wiring

#5

Post by Perry Ruiter » Tue Jul 28, 2009 7:24 am

craig60pan wrote: Perry
Are you doing any speedo rebuilds again? Last we talked you were focusing on your own stuff. I might have a candidate if you are. It came off the 51 but I think it is from a 60 police bike.
Looks nice but the trip odometer is bad, not sure if the speedo works as I have not had it running yet, but hopefully will know soon.
CJ
I'm perpetually behind as usual but always happy to help a past customer if I can ... Perry

craig60pan
Posts: 181
Joined: Fri Dec 31, 2004 2:37 pm
Bikes: 1960 FL
1951 FL
Location: Atlanta

Re: 1951 fl horn switch wiring

#6

Post by craig60pan » Tue Jul 28, 2009 3:43 pm

Thanks perry, hopefully in the next few weeks it will come to life again.
CJ

Post Reply

Return to “Electrical”