Battery Source Test
- Without disconnecting coil, connect voltmeter between coil "BAT" terminal and engine ground. Connect a jumper wire from coil "DEC" terminal to a known good ground.
- Turn all lights and accessories off and turn ignition on. A voltmeter reading between 4.9-7.9 volts indicates primary circuit from battery to coil is okay.
- If reading is less than 4.9 volts, inspect primary wiring and resistance wire for worn insulation, broken strands and loose or corroded terminals. If reading is greater than 7.9 volts, check and replace resistance wire as necessary.