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Relays can be a pain sometimes. There are two acceptible methods for checking relays ( that you can do at home anyway) the first and easiest is to simply swap it with a known good relay of the same specs. if this is not possible then the only other way is with an ohmeter ( a quality multitester is a must have for any do it yourselfer). compare the suspect relay to it's connector there should be four wires, two thin (control circuit) and two thick (power circuit). you need to connect your ohmeter across the power circuit. and connect a jumper wire to each control circuit terminal. connect one jumper to the ground post on your vehicles battery and touch the other to the positive for no more two seconds at a time while watching your ohmeter. If the relay is working properly you should have less then one ohm showing. if the reading is high, or the tool does nothing, you've found you're problem, otherwise, start following wires and checking for voltage, or check the whole system by jumping the power circuit. check the control circuit with an ohmeter, turn the switch on with battery disconnected and key in run position and check ohms across the relays empty connector, more than 2 ohms means a short or bad connection. good luck and be careful out there eh..

PS... use a stick or something between the horn and seat to keep the switch closed while you check the control circuit ( one person can bleed brake systems with this technique).

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