'02 Rodeo electrical mess

Our 02 Rodeo went nuts last week...the left blinker was on solid, and the radio would turn on and off when the blinker was actuated. My wife drove it
that way about 30 miles, and as she finished her appointment and tried to come home, she couldn't get it out of park.
Towed to the nearby garage, where they're stumped so far. I don't know if this matters, but the problem started on the coldest morning of the year-so far. But, the Rodeo is in the mechanic's heated garage right now and it's still busted.
Any ideas?
-John O
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John O wrote:

You need to take it to an automotive electrical specialist rather than a typical garage. Most garages struggle with electrical issues but still charge you for all the time spent.
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Turns out there was a short in the trailer light module (per the repair order). Cost me 1.4 hours labor and a fuse, under $100. Whew.
-John O
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