The loom plugs that run along the back of the bulk head usually give up the ghost first, but there isn't really a specific part of the loom that goes its just that they are old and have had years of heating up and cooling down which fooks up the looms ability to hold current,

with my car the first time the problem happened I had the loom plugs removed and joined the loom together, this lasted for about 16 months but then problem returned, now have new engine loom and all is sweet


Luciano