When i press the horn switch I only get 4 volts at horn
Use a multi-meter set to dc 12v take the horn out of circuit and connect the positive end to the horn supply from the horn switch and the negative to an earth point on the frame. Press the horn button, do you see the meter jump up to 12v when you do this?
Yes - Replace the horn assembly. It's getting voltage but not sounding.
No - Suspect that the wiring or the horn switch is faulty.
isolate the battery. Disassemble the grip Disconnect the wires to the horn. Set the meter to continuity test. Put the probes on the terminals of the horn switch. press the switch. Do you see the meter on the Multi-meter kick?
Yes - suspect the wiring between the switch and the horn assembly.
No - With the 12V side of the switch isolated from ground reconnect the battery. Switch the multi-meter to DC Volts. Connect the positive probe to the supply side of the switch wire and ground the negative side. Does the meter kick to 12Volts?
Yes - I don't know what is wrong. possibly an intermittent fault.
No - You have no supply form the battery. Suspect the wiring loom from the battery to the switch especially where it goes from the frame to the handlebars. You could have a break there.
PS. 4 Volts at the horn indicates a resistive circuit or a failing battery.heck the battery voltage at the teminals when out of circuit then on load. Check the switch contacts for oxidisation and clean if necessary with a CTC substitute. Check the volts before the switch as described to trace the cause of the resistance.
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