Question about Toyota 4Runner
The wiring for the solenoids that power the transfer box levers are routed thru the same fuses that power the instrument panel. They got blown because the current passing thru them is too high.
This happens in only 3 cases:
1 - the wiring itself is faulty: some wires are frayed and they touch the body shorting the entire system. You will have to inspect the entire wiring starting with the buttons and all the way to the transfer box and the differential, locate the faulty wires and insulate them properly.
2 - one (or more) of the solenoids has failed and now it acts as a short - you will need to remove and test them one at a time - replace the failed one.
3 - the levers inside the transfer box and/or the differential are jammed so the solenoids stay active for way more than they should and the current grows excessively. You will need to remove the solenoids and try to move the levers manually - the ones you can't are jammed. To find out why and fix it the transfer case and/or the differential will have to be removed from the truck, dismantled and inspected.
Posted on May 28, 2011
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Posted on Jan 02, 2017
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