1980 Chaparral 187 with 470. Last season had trouble keeping it running. Never got it on the water, would run on muffs initially, then couldn't keep it running. Installed new points, coil, plug wires, and plugs. Rebuilt carb, coverted to alternator. Previous owner had converted to electric fuel pump.
Gave up on it last year, now back to working on it.
Starting with ignition system. Set point gag to .018. Coil ohms out within spec, strong spark on all 4 plugs. Engine started and ran. Runs rough, but expect that until I get dwell and timing fine tuned.
Now for my question. Checked voltage at purple wire at coil and I get 12v with key in run position. Disconnect wire from choke and coil to check resistance and it shows no resistance. Which explains the 12v at coil. Maybe someone has removed the ballast wire? The replacement coil I installed is an external ballast coil. Since I have 12v at coil should I install an internal ballast coil? Don't want to burn the points up and have the coil overheat. The coil that was on it was solid black with no markings, so no way to tell if it was internal or external ballast.
Gave up on it last year, now back to working on it.
Starting with ignition system. Set point gag to .018. Coil ohms out within spec, strong spark on all 4 plugs. Engine started and ran. Runs rough, but expect that until I get dwell and timing fine tuned.
Now for my question. Checked voltage at purple wire at coil and I get 12v with key in run position. Disconnect wire from choke and coil to check resistance and it shows no resistance. Which explains the 12v at coil. Maybe someone has removed the ballast wire? The replacement coil I installed is an external ballast coil. Since I have 12v at coil should I install an internal ballast coil? Don't want to burn the points up and have the coil overheat. The coil that was on it was solid black with no markings, so no way to tell if it was internal or external ballast.
