PACCAR 579, 567 — How to inspect and replace a fuse

EMERGENCY - How to inspect and replace a fuse avoid damaging the electrical system. 2. Determine from the chart on the fuse panel which fuse controls that component. If the circuit has a fuse, remove that fuse and see if it is blown. If the circuit has a polyswitch, have your electrical system inspected by an authorized dealer. not available, a fuse of a lower rating may be temporarily substituted. You can also use a fuse from a circuit you can do temporarily without (for example an accessory circuit or radio). CAUTION Never patch fuses with tin foil or wire. This may cause serious damage else- where in the electrical circuit, and it may cause a fire.

2 CAUTION CAUTION When replacing a failed polyswitch (circuit breaker), always use an ap- proved polyswitch (circuit breaker) with a current rating equal to or less than the polyswitch (circuit breaker) being replaced. Only use the approved Type II modified reset polyswitch (circuit breaker). NEVER use a Type I (auto- matic reset) or Type III (manual reset) polyswitch (circuit breaker). A fuse with a current rating equal to or less than the polyswitch (circuit breaker) being replaced can also be used. If a circuit keeps blowing fuses, have the electrical system inspected for a short circuit or overload by an author- ized dealer as soon as possible.

Fail- ure to do so could cause serious dam- age to the electrical system and/or ve- hicle. Fuse Puller CAUTION Before replacing a fuse, turn OFF all lights and accessories and remove the ignition key to avoid damaging the electrical system. 1. Turn OFF all lights and accessories and remove the ignition key to If it is blown, replace it with a fuse of the same rating. If a fuse of the same rating is Y53-6047-2HEN (03/18) 45