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.
Series III fairing removal:
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