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Jeremy, Certified Truck/Bus Technician
Category: Medium and Heavy Trucks
Satisfied Customers: 3304
Experience:  ASE Med/HD Truck Technician, NATEF Diesel Engines and Electrical/Electronics Technician, EPA 608/609 HVAC Certified, Steering/Suspension and ABS/Brakes Technician
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I have a 1997 rd688 Mack or roll off truck fuse number 18 in

Customer Question

I have a 1997 rd688 Mack or roll off truck fuse number 18 in the fuse box keeps keeps clicking on and off what other components are on that circuit
Submitted: 1 year ago.
Category: Medium and Heavy Trucks
Expert:  Jeremy replied 1 year ago.

My name is ***** ***** I will assist you.

I believe fuse 18 is your spare circuit, so anything you have on the spare or the optional circuit is what will be on that circuit.

With this being a roll-off, maybe exterior lights on the rear or the PTO might be on it? Each body manufacturer will use a different source for the spare. That isn't Mack installed. They only provide the circuit. The roll off company or whomever set the truck up is who tied into it.

It is also possible that you have nothing connected to it and the wire is open and touching along the frame at the body builder add on box, which should be on the left frame, just about the back side of the cab.

The other area is on the firewall, driver side, behind the engine. The wires will just come to a end with caps on them.

Expert:  Jeremy replied 1 year ago.

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