Checking Ignition Coil and Ht Leads

TESTING IGNITION COIL, BALLAST RESISTOR AND HT LEADS





TEST CONDITIONS
Components should be at a temperature of about 20°C (68°F).
All leads must be disconnected from the components when taking measurements.





MEASURING RESISTANCE OF BALLAST RESISTOR
Resistance: 0.9 ± 0.1 ohms
(Both resistors are connected in series)





CHECKING IGNITION COIL
- Check outer casing of ignition coil for cracks etc.
- Measure resistance across terminals 1(-) and 15(+).
- Resistance: 1.9 ± 0.1 ohms





- Measure resistance across terminal 1(-) and high tension terminal.
- Resistance: 9.5K ± 1.5K ohms


CHECKING RESISTANCE OF IGNITION CABLE SUPPRESSORS
- Measure resistance of suppressor at spark plug end of ignition cables.
- Resistance: 5K ohms

- Measure resistance of suppressor at distributor end of ignition cables.
- Resistance: 1K ohms

CHECKING RESISTANCE OF COIL WIRE
- Measure resistance of coil wire.
- Resistance: 5.6K ohms per meter


NOTE: Resistance values are given in K ohms per meter of length. (Measure lead in order to compute correct value.) All values have a permissable tolerance of +/- 20%.