I'm quite interested by this - it sits well with a theory I've recently developed about my truck. I've been wondering how many of the "faults" it has are actual faults and how many might just be crap connections/earths?
What got me thinkning was the state of my blower connector when it finally came off - the return had clearly been very hot for some time. The other thing that I've noticed is my fuel gauge will vary by half a segment (1/8 tank) for no apparent reason, Sometimes it's higher, sometimes lower - and it's not related to vehicle attitude of fuel volume. I can drive home from work and arrive with (apparently) more fuel than I left.
Same goes for my gearbox "fault". Sometimes it takes an hour for the light to flash, sometimes it's from the turn of the ket. Sometimes it comes on then goes off. Sometimes it comes back.
All sounds electrical soemhow and having seen the above, I'm even more inclined to poke around.
Didn't mean to hijack the thread by the way but it's a great example! Any experience anyone?
Cheers,
Jon