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Hi firends
I recently looked at the ballast on my long sitting all OEM 289 66 . The old ballast connector were loose so i replaced the unit and get lower results. I have a Blaster 2 MSD coil and old school points. Nuthin in my car is modified./.
Here was my prior readings with old ballast .
Okay here's what I get at the engine compartment. I lean over the engine, with my meter test leads . first ballast connection closest to firewall ( wire from firewall is red ) then connected to block I get 11.1 volts. Both leads to each ballast connector 7.77 volts. Ballast connector closest to radiator ( call it front ballast point ) and then lead to block/ground 3.5 volts . "front ballast point' to "+" connector new coil .75 volts. front ballast point to "-" on new coil 3.0 volts . and i drive this car just fine.
So i installed the new MSD recommended 1426 model resistor .8 ohm resistance with my MSD coil. . I get 12 volt from the fore wall 5.5 volts across the ballast leads and 5.5 volts onward tot he coil POSITVE terminal.
Did I purchase the wrong ballast . Is the voltage to low? should it not be 7-9 volts onward to the coil.?
The wire from the firewall seems not to be a resistance type wire, but what do I know.
The ( call it front ballast point ) contain two black wires one going to the coil the other go to rear of engine probably to solenoid.
I recently looked at the ballast on my long sitting all OEM 289 66 . The old ballast connector were loose so i replaced the unit and get lower results. I have a Blaster 2 MSD coil and old school points. Nuthin in my car is modified./.
Here was my prior readings with old ballast .
Okay here's what I get at the engine compartment. I lean over the engine, with my meter test leads . first ballast connection closest to firewall ( wire from firewall is red ) then connected to block I get 11.1 volts. Both leads to each ballast connector 7.77 volts. Ballast connector closest to radiator ( call it front ballast point ) and then lead to block/ground 3.5 volts . "front ballast point' to "+" connector new coil .75 volts. front ballast point to "-" on new coil 3.0 volts . and i drive this car just fine.
So i installed the new MSD recommended 1426 model resistor .8 ohm resistance with my MSD coil. . I get 12 volt from the fore wall 5.5 volts across the ballast leads and 5.5 volts onward tot he coil POSITVE terminal.
Did I purchase the wrong ballast . Is the voltage to low? should it not be 7-9 volts onward to the coil.?
The wire from the firewall seems not to be a resistance type wire, but what do I know.
The ( call it front ballast point ) contain two black wires one going to the coil the other go to rear of engine probably to solenoid.