help car doesnt crank over. (clutch interlock switch)

[fcdrifer17]

i recently got my car running about 2 weeks ago and now it doesnt crank over. it does a click sounds like its commoing from the fuse panal. a couple of days ago i had this problem and searched and found out to be it was the clutch interlock switch.. the owner before me must have bypassed the switch and just wired those to wires together and came apart.. i rewired them back and it started great for a couple of days.. now it doesnt want to start.. the wires to the interlock switch are wired together.

if i turn the key and hold it on start the main fuse in the engine bay will pop..

at the time of the swap i lost the negitive ground wire that goes from the battery to the block. so i used another wire about half the size and connected it from the battery to the block.. maybe its to thin?

is the clutch interlock switch bypassed right or am i soppose to ground it?
anybody have any ideas? thanks.