I have recently fitted new glow plugs to my 1997 3.1td trooper, but this doesnt seem to have made any difference, in fact it seems to be getting worse at starting, especially in this cold snap we are having.

Can anyone tell me how I can check to see that the circuit feeding the glow plugs is working correctly?

If I pull a plug out and it does not glow, that doesnt tel me there is enough power getting to the plugs.

I bought the plugs off ebay, so dont know if that may be my problem

Can anyony help