Need help with my zz502

[drdave69]

By the way this is in my 1966 Corvette. The Holley is no longer on the engine. It has FAST EFI now. I recently checked the ground strap from the engine to the front crossmember and cleaned the surfaces. I also installed a second ground strap on the other side of the engine to the frame rail (with cleaned surfaces).

The 502 has the HEI that came with the engine 12 years ago. I bought another new coil this past Saturday, installed it and it did not cure the problem.

I do not know how to hotwire it but I will check the voltage when cold and hot.

Thanks for the info.

[earntaz]

On the side of the HEI cap that holds the coil you will see connections (should be on the drivers side ... if someone has jacked with it) -- one is marked IGN ... run a hot wire from a good 12V source to there. OR hook up a volt meter to this IGN source and see if you have 12V with key in the ON position -- 12V during cranking ... TAZ

[drdave69]

Originally Posted by earntaz

On the side of the HEI cap that holds the coil you will see connections (should be on the drivers side ... if someone has jacked with it) -- one is marked IGN ... run a hot wire from a good 12V source to there. OR hook up a volt meter to this IGN source and see if you have 12V with key in the ON position -- 12V during cranking ... TAZ

I'll check it with my volt meter for IGN and Crank when cold and hot.

[Big Block Bill]

Originally Posted by drdave69

By the way this is in my 1966 Corvette. The Holley is no longer on the engine. It has FAST EFI now. I recently checked the ground strap from the engine to the front crossmember and cleaned the surfaces. I also installed a second ground strap on the other side of the engine to the frame rail (with cleaned surfaces).

The 502 has the HEI that came with the engine 12 years ago. I bought another new coil this past Saturday, installed it and it did not cure the problem.

I do not know how to hotwire it but I will check the voltage when cold and hot.

Thanks for the info.

Make sure the metal ground strap under the coil is present. It goes from a coil mounting screw to the cavity in the cap next to the 12 volt power supply. I had a Cadillac that drove us crazy from someone leaving it out when they changed the cap / coil. Just an idea FWIW.

Bill

[earntaz]

Originally Posted by Big Block Bill

Make sure the metal ground strap under the coil is present. It goes from a coil mounting screw to the cavity in the cap next to the 12 volt power supply. I had a Cadillac that drove us crazy from someone leaving it out when they changed the cap / coil. Just an idea FWIW.

Bill

Your right --

[drdave69]

Originally Posted by Big Block Bill

Make sure the metal ground strap under the coil is present. It goes from a coil mounting screw to the cavity in the cap next to the 12 volt power supply. I had a Cadillac that drove us crazy from someone leaving it out when they changed the cap / coil. Just an idea FWIW.

Bill

It is present.