> To relay or not to relay. That is the question.
I would suggest adding both a relay and a suppression diode to reduce arcing
at the relay points. The stock horns are quite loud, if they are properly
adjusted and you get enough current to them; but the horn contacts and the
wiring to them tend to limit the current available.
But you'll need to either find a 4-terminal relay, or alter the wiring to
the stock horns somewhat. The 3 terminal relays (at least the ones I found)
assume that they have to supply 12v to the horns rather than grounding them.
And because the horns are highly inductive loads, you want a "horn" relay
with oversize contacts rather than a standard relay.
Randall
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