Short in the courtesy light receptacle, wiring, or the switch. Can also be a corroded receptacle.
There must be a short in the system somewhere that causes the fuse to blow.
This is the starter fuse I am talking about. It doesn't blow every time. It might go weeks before it blows again.
to many plugs in at once or old circuits ECT.
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Ck the heater fan motor resistor .
where in the left fuse box ,interior courtesy lights, amp-color
Need to know which 20 Amp fuse is blowing.
no A FRN fuse is a slow blow fuse where an non is a fast blow fuse. In a pinch a slow blow fuse can be use in a fast blow circuit but not the other way around.
short circuit in the circuit
There is a electrical short somewhere...
Tail light assembly short
One of the gauges or wiring has shorted to ground.