motor wont stay running

Go the electrical section; quicker response on this matter there.
- Your '64 would have both wires direct to the coil +, one direct from the ignition switch during START, and then one that feeds power to the coil + through the ballast for RUN.
- What you need for the for the later system is those 2 wires plus a wire that feeds battery voltage to the box anytime the switch is in START or RUN.
- The original /6 ballast would be right but do you have it? Just putting any old ballast resistor in there does not work well.
67Dart273 said
Wired wrong. Some of the diagrams shown for that setup are misleading

THERE IS NO NEED TO CHANGE THE WIRING specific to the original ballast resistor. If they gave you a new resistor, simply unhook the old and install the new. Then run the power wire "from the box" to the "key" side of the ballast or to the IGN terminal on your voltage regulator

SIDE NOTE CHECK for voltage drop. Turn key on, engine stopped. Check voltage at VR "IGN" terminal. Compare that voltage to battery. Should be within 3/10 or less "same as battery." If not you have a harness/ voltage drop problem

Additionally make SURE the ECU box is well grounded. MUST be grounded, as well as the VR
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OP...listen here ^^^^^