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I am having some electrical niggles and want to check all of the earthing points for corrosion. I know there is one on the front head as well as one on the gearbo, but where are the rest?
 

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What kind of electrical niggles? Any particular reason why you suspect a fault routing to 0V?

Personal opinion: I would suggest that even if you do find corrosion at such points, the corrosion is just as likely to be protecting a decent connection beneath. Besides, they are generally located at positions that are well protected from the elements.

If you haven't already, do the basics: continuity checks to the equipment in question, measure the V+ present. Let us know if you find anything interesting.
 

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try cleaning up the batery terminals, pour BOILING water over them, after remocing the conenctors & over the connectors too.... then apply vaseline over the tops of them to seal them for future corrosion.

earth points:

* gearbox x 1

* on each valance, jsut under head lights x 2 [ ...13mm headed bolts ]

* ecu frame [ t25 headed bolt ]

* on the head near throttle body [ TS ] or front head [ V6 ] ...13mm headed nuts
 

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also earth points in boot x 2, around lights + 2 more on 'A' pillars, knee height
 
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