VW Electrics bad earths
Hacksawbob
Behind main fuse box in front of (Right hand drive, passenger side) fusebox. there are 2 "crowns" of earths that may want attention. Count how many spades terminals are free so you don't miss any putting them back. might be an idea with all those earths hanging around to disconnect the earth strap from the battery as the fuse panel is still live. You may depending on the state of the terminals want to replace them, use metal ones, not plastic coated as the space between spades is limited. I held each one in a pair of needle nose pliers and wire brushed them.
EXAMPLE
no wipers
no sidelights
no interior lights
no dash lights
no tail or numberplate light
all at once
use the flasher and they all work again as long as you hold it
checked all the fuses on the board ...ok
late fuse board fitted This happened to kevtherev.
He fixed it by removing the fuse board and checking the 'crowns'as the symptoms pointed to earth connection [10] (haynes) wiring diagram. connection [10] was common to all of the non functioning items
sure enough the crown was badly earthed...probably due water ingress, or recent fitting of a radio and speaker wires
Footnote...A poor connection of the main feed into the fuse board (thick red wire, white connector) will also cause similar problems
Gearbox
there should be at least one earth going from gearbox to chasssis, some folks add a second just to be sure. Update 2012 Recent findings by Aidan the resident gearbox re-builder suggests that the front nose earth on the gearbox is leading to premature failure of the box due to nose cone corrosion (disimilar metals + electrical connection + small gap for water to gather) , and seems to be particularly an issue with 5 speed boxes, he recommends that the earth strap be connected as close to the starter motor as possible and the nose cone earth is removed particularly on 5 speed boxes where this is more of an issue.
Engine block to left of engine block to engine bay. Particularly on 2.1 injection engines this is a prone point for failure after you have checked the gearbox one above.
