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Is it normal to have only 10.6v going to the ballast resistor when the key is on? Battery at 12.1v. When the line is connected to the ballast resistor, it drops to 9.1v and the other side 5.5v. 1970's Electronic ignition. Mix match of several parts on a 1972 Duster.

Anyone use a vintage battery topper on a gel-type Optima battery?

Trunk mounted battery with disconnect switch (4 post). I'd like to run a relay up front to avoid having more hot wires running the length of my car. Where are the best places to slice the relay into? 1972/74/77 wiring.