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In my experience, the OD solenoid insulation seems to be a bigger problem than the relays, tnd the fact that you are blowing fuses indicates a short somewhere. Pull the OD solenoid, clean and inspect the wires, and reinsulate or replace them as necessary.
This is a bit heretical here on BBoard, but I feel that 90% of the drivers never really need to disable the OD. The exceptions are folks who tow things or live in a really hilly area. I have taken to bypassing the system by modifying the solenoid so that it is always open (see the archives). The existing system was unreliable when new, and 15 years do nothing to improve that reliability. Think about it. The system has four common failure modes: wear in the shift knob switch,
chafing of the switch wiring in the shifter, fatigue failure in the OD relay solder joints, and shorts in the solenoid wiring. While an OD failure doesn't technically leave you stranded, it can make freeway driving dangerous, and the problem is a PITA to diagnose and fix. Removing a solenoid paying close attention to cleanliness to brevent dirt from getting into the tranny.
End of lecture ;-) and good luck to you!
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