i had the a similer problem on my series one mate what i did was take the amal valve off spray some wd40 in thier and kept on clicking it with (with a probe tester) to free it off
the other wire goes back to the ecu which in fact pulses thats why it looks like their is no earth or live on my probe tester it would show a live but it wasnt if you understand what i mean
if anymore probs pm me and ill pass my number over to you cheers