Ballast Resistor Check (Model 9BR)
- Some models such as the TR8 may be equipped with the Model 9BR Ballast Resistor, a unit consisting of 4 resistors and a printed wiring board mounted in an aluminum heat sink. One side of resistor is connected to (1) starter solenoid ignition terminal, (2) ignition switch and (3) to tachometer. The other side has 2 connections to distributor pick-up coil and 2 connections to primary terminals of ignition coil.
- Turn ignition switch "OFF". Connect ohmmeter leads to each set of terminals shown in Fig 1. Resistor reading "A" (tachometer connection) should be 9, 000-11, 000 ohms. Reading "B" (drive resistor) should be 0.5 ohm; reading "C" (ballast ignition resistor) should be 1.62-1.80 ohms, and reading "D" (ballast resistor) should read 0.25-0.28 ohm. If not, replace ballast resistor assembly.