High-G FJR Junkie!
Join Date: Apr 2013
Location: Corinth, TX just south of Denton on I35E
I know that MamaYama, with no other changes to the horn wiring, went to a single (anemic) horn on the Series III FJRs. The earlier bikes seem to work just fine over the years without a horn relay.
The previous horn threads are pretty much split on the necessity for a relay when you install that particular dual horn kit. I decided that a horn relay wasn't necessary.
So I was curious . . .
I got out my handy-dandy DMM and measured (when in doubt, always measure, if possible) the current both sets of horns pull. Results: The single OEM horn seems to pull about 55% of the current that dual PIAAs pull, further reinforcing my belief that a relay wasn't necessary.
On the other hand, it's your bike. If installing a horn relay with the PIAAs will help you sleep better at night, go for it. These automotive relays are not very expensive.
Time spent looking at motorcycles, even Harleys, is never wasted.
Series III fairing removal:
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