£90 to get a bulkhead dipped in dudley ;) my good mate has a landrover garage in leicster, he has a ashtree galved bulkhead in stock, and a chassis for that matter! Give me a p.m if you want his details!
Hmm maybe, but i like things to look correct, i am welding a stainless side exit at the moment, £80 is not a bad price against the time i have took,stainless wire and pipe.
You need to buy a cheap multimeter from maplin to see if you have approx 12.6v at the lamp... If so it is the earths, connect a long cable to other side of lamp and take it back to negative on your battery. It is easy ;)
No mate either the neg on your battery fitted to the car, or a nice clean earth on the body, which the negative of the battery is connected to, hence the term negative earth ;)