After putting my motor back together (with a rebuilt wire harness) I have no spark. The CD box is humming. So I have done the following tests:
1. Check Voltage at CD Box, red center wire in plug under CD box with key on - 12.16V - good
2. Check resistance between CD Box and intake manifold to check ground (.4 ohm) - good
3. Telegraph test - I didn't have a way to hook the plug up to the lead wire from the coil so I used a jumper cable. Anyone see an issue with this? I then ground the base of the plug and then unconnect the signal wire from the distributor. I then turn on the key and tap the signal wire to a ground point. - No Spark
4. So either wiring, coil or CD box is bad. I test the resistance on the coil. Between the two connectors the resistance is .6 ohm.
Resistance from lead to cap and one of the connectors on the coil: 4100 ohms.
I think I need to get a test coil to eliminate that. Also my harness is new, what can I do to check the wiring? Any good tests I am missing?
thanks,
Jesse
1976 911S