I installed LED backup lights a few months ago.  They worked fine, but now
they are on all the time.  This is an automatic, so I pulled the blue black
wire at the shifter switch and measured 5.2v at the wire where there should
be zero.  This is enough to light the LEDs, but not the old bulbs, which I
reinstalled.

Since this wire is in a harness wrapped inside a sheath, I'm thinking the
only fixes are to leave the old bulbs in or run a new wire.  But, where
would 5.2v come from?

Anyone interested in a deal on LED backup lights?

Stuart