I don't like the coincidence either, especially if they appeared at about
the same time. I'm wondering if there is electrical trash on the power
system driving the two controllers wild. The easiest thing to check (even
though it is a long shot) is the engine ground - usually a braided wire from
the valve cover gasket to the frame in front of the radator. Make sure the
wire isn't broken and doesn't turn with finger pressure at either end.
Measuring across the battery with a digital voltmeter when the engine is
running should show between 13 and 16 volts DC and (more important) less
than 0.1 volts AC. An analog meter can't be used unless it has an "output"
jack because the DC component interferes with the reading.
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