no part # on relay. relay came with airhorn. Pink wire from org.wiringto post-85 on relay, same as wiring diagram on instal paper came with horn. brown wire from bike to post-86, same aswiring paper,new wire from + side of batt,14ga, to post #30 on relay,is 20amp fused,post 87 to + side of horn, new wire from - sdf batt t - side of horn. maybe cheap relay. dont remember which sight i got wiring instructions from . but it all jives:confused24: