Hi everyone!! I have a C4000 Combilift s/n 4045 - with the GM 4 cylinder (cast iron head) that has no spark!! I have replaced the ignition coil and the ignition module to no avail. I have voltage at both the distributor & the coil. The rotor is turning when cranking, the leads test ok, cap & rotor look ok. This particular coil has two plugs that push in together to form a 4 pin plug. Negative side seems to test ok as does the 12v side. I'm wondering if maybe I have a distributor fault?