03-10-2015, 05:20 PM
The factory earth goes through a variable resistor that changes resistance depending on the fuel temperature sensor according to the wiring diagrams. Most likely to change fuelling depending on the temperature of the fuel.
View my build thread here
http://306oc.co.uk/forum/showthread.php?tid=28072
http://306oc.co.uk/forum/showthread.php?tid=28072