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Electric Horn System.
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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Battery.
TM 5-4210-220-12 4-24.  ELECTRICAL SYSTEM - Continued REPAIR (1) If one or both horns fall to operate, remove wire from horn and connect a 12-volt bulb between ground and the wire. (2) Press horn button and check lamp lights.  If lamp does not light, check continuity of wire 38 between horns and horn relay in cab fold-down instrument panel. (3) If relay does not operate, check wire 36 on relay terminals 3 and 4 is at 12 volts.  Check continuity of wire 37 between relay and steering column. (4) If all wires and voltages are satisfactory, fault is either at horn button, in horns or is the relay.  For horn button replacement, see para. 4-25.1.  For horn replacement, refer to REPLACEMENT preceding.  For relay replacement, see para. 4-24.7. 4-455

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