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1978 R100RS horn relay confusion

swampdog57

New member
Hi Folks, This is my first post here. Purchased a 1978 R100RS from my neighbor and am most of the way through a semi restoration. (Rebuilt engine, carbs, calipers, master cylinders, struts, etc, etc.) I've learned (and spent) a lot!

Here's a peculiar one for you. Connected battery and heard a relay click. Tracked it down to the horn relay. Perused the schematics and couldn't figure how that was possible. With the help of the amazing and brilliant Brooks Reams and his schematic descriptions, I concluded that the new horn relay is a different configuration, with terminals 30 and 86 swapping places. Going back to order the right one!

It took a lot of head scratching and schematic searching to figure this out!
 
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Welcome to the forum!
There is a chance that I remember talk of the switch actually switching in ground rather than the switch actually switching power. A number of vehicles used that system and confused people looking at wiring.
Hopefully I have remembered something that helps.
Good luck.
OM
 

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