In article , says...
No amount of expoereince would have helped that one, and apart from the
ability to read a circuit diagram and the basic idea that it is JUST
possible for a diode to blow short circuit rather then open circuit,
nothing more than a ruthless dedication to 'eliminating the impossible,
till whatever is left must be the truth' was sufficient.


A friend had her clutch replaced, followed by the indicators blowing a
fuse each time you used them. Without a circuit diagram I was stuck -
walked to the library and within two minutes found that the reversing
lights are on the same circuit. Ah - easy then, the reversing switch
wire was caught in the bellhousing. And so it was.

Without the diagram though, I could have struggled for ages.

--
Skipweasel.
Never knowingly understood.