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Ignition Coil Resistance

  1. Disconnect electrical connector and distributor wire from ignition coil. To measure primary resistance, measure resistance between terminals of ignition coil.
  2. To measure secondary resistance, measure resistance between positive wire terminal at ignition coil and coil secondary tower. See IGNITION COIL POSITIVE TERMINAL IDENTIFICATION  table. If resistance is not as specified, replace ignition coil. See appropriate IGNITION COIL RESISTANCE table below.
IGNITION COIL POSITIVE TERMINAL IDENTIFICATION

Application Wire Color
ES300 Black/Red
GS300 Black
LS400 Black/Red
SC300 Black/White
SC400
Coil No. 1 Black/Red
Coil No. 2 Black/White
IGNITION COIL RESISTANCE (ES300) - Ohms

Application Primary Secondary
Cold (1) .70-.94 10,800-14,900
Hot (2) .85-1.10 13,100-17,500
(1) Coil temperature of 14-122°F (-10-50°C).
(2) Coil temperature of 123-212°F (51-100°C).
IGNITION COIL RESISTANCE (GS300) - Ohms

Application Primary Secondary
Cold (1) .21-.33 6400-11,100
Hot (2) .27-.39 8200-13,000
(1) Coil temperature of 14-122°F (-10-50°C).
(2) Coil temperature of 123-212°F (51-100°C).
IGNITION COIL RESISTANCE (LS400 & SC400) - Ohms

Application Primary Secondary
Cold (1) .36-.55 9000-15,400
Hot (2) .45-.65 11,400-18,100
(1) Coil temperature of 14-122°F (-10-50°C).
(2) Coil temperature of 123-212°F (51-100°C).
IGNITION COIL RESISTANCE (SC300) - Ohms

Application Primary Secondary
Cold (1) .21-.33 6400-11,100
Hot (1) .27-.39 8200-13,000
(1) Coil temperature of 14-122°F (-10-50°C).
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