Medium and Heavy Trucks
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Hi my name is***** will be glad to try to help. Check all your fuses and relays and if okay be sure to clean and inspect all grounds for poor connections or damage that will cause a loss of connection in the circuit. Check the wiring for damage and corrosion in the wires and connector pins. Also do a wiggle test of the wiring with the problem occurring to see if it effects the tach helping isolate a short or loose connection. Let me know
Thanks for the update. Are you using a test light and volt/ohm meter or more of a visual inspection?
Hi, Did you get this resolved?