I know this was a major issue in the superduty, but take the steering column apart and trace the wire that comes from the OD switch at the end of the lever... it goes across the steering column and wears thin and shorts out.... I have fixed one to two like this...
No I have not done any aftermarket stuff, its all stock. It does not blow immediately, it take a day or two. I will try and turn dimmer down to see what it does. The CJB is the fuse panel inside by the hood release lever right? On the drivers side lower left?
put new fuse in, turn ignition on, violently rip the the shifter down to 1 than P than 1 than P.... do this a few times, violently!!! if th efuse pops, you know the OD button harness is wearing thin and shorting to the column
This is how i diagnosed the issue.... if this is your problem... what your doing is stretching that wire harness from the OD button to over the steering column, shorting it out if the wire insulation is damaged...
That could be the cause, or it could be :
2. Function Selector
3. 4WD mode switch ( if 4x4 )
4. Ashtray illumination
5. steering column illumination
6. Circuit to / or instrument cluster illumination
7. Any of the power window / power door lock switches or the wiring for this to the doors
8. overhead console
9. adjustable pedal switch or rear sliding window switches ( if equiped ).
You can leave the dimmer switch connector C 245 unplugged ( 6 pin connector, all in 1 row ) and jumper the power in to the power out, and see if you blow a fuse.
Think the connector is 1/8" spade terminals. Should be able to make a jumper, and place it in the connector that is unplugged, by passing the dimmer switch all together.
The connector orientation should be with the tab to the right, pin #1 is on the top, Pin #6 is on the bottom.
Jumper pin #1 to pin #6 ( this should be Dark Blue w/ White stripe wire to light blue w/ red stripe wire ).
The panel illumination should be at full brightness ( just before the detent for the interior lamps ). I have not tried this myself, but the test for that section of the panel illumination is to test the switch with an ohm meter from pin #1 to pin #6, and as the dial is rotated from high to low ( brightness ) the resistance should go from low to high.
If the Resistance is removed, there is not a voltage drop in the circuit, lamps should be full bright.
This should be an easy test, next step is removing illumination via connectors ( need to remove the pin from the connector with the molex tool ) to see which branch is causing the problem if the fuse still blows.
I have a 2003 Supercab with the same problem. I tried a new switch with no luck. The switch is like $160.00. I would see if you know someone that has the same switch and try that before buying one. It is a special order. Most dealers don't have it in stock.
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