The wires can be tested from the larger of the plugs in your gp relay. Pop it off and there are the termination points for each gp clearly marked on the connector.

To ground, each of them should read less than one ohm. Best scale to read them on is your lowest one.

__________________
1985 300D 198K sold
1982 300D 202K
1989 300E 125K
1992 940T

"If you dont have time to do it safely, you dont have time to do it"

"The democracy will cease to exist when you take away from those who are willing to work and give to those who would not."