My 841 is converted to 12v. I used the JMOR 601/801 diagram I found on YT to do some rewiring from the original conversion, which I did not do. I have an external resistor and a 12v coil. When I switch on power, I thought I should get 12v at entry to resistor and around 7-8 on output side. When I check it there is 12v+ at every checkpoint all the way to the distributor. I put a new resistor in the circuit, and it checked the same. Both resistors test at about 3 ohms. And I have used the original one for years. Does the voltage only drop when the engine is running or am I missing something obvious.