Engine Electrical Systems



Charging System Electronic Ignition System
Conventional Ignition System Starting System
Torque Specifications

Charging System
Alternator and Generator Brush Wear Limit1/4 in
Generator Brush Spring Tension40 oz
Motorcraft Alternator Output Voltage
TemperatureVoltage Range
0 to 5014.1 to 14.8
50 to 10013.7 to 14.5
100 to 15013.4 to 14.2
150 to 20013.1 to 13.8

Electonic Ignition System
Coil Resistance
1974 through 1977
Primary1 to 2 ohms
Secondary8000 to 17500 ohms
1978 through 1986 150 cu in 4-Cylinder, In-Line 6-Cylinder & V8 Engines
Primary
75F1.13 to 1.23 ohms
200F1.50 ohms
Secondary
75F7700 to 9300 ohms
200F12000 ohms
1980 through 1983 4-Cylinder Engine
PrimaryZero or near zero on the low scale
SecondaryLess than infinity on the high scale
Coil-to-GroundInfinity
Cranking Voltage Test
1974 through 1977
Switch-on Voltage12 to 13 Volts
Cranking Voltage9.6 Volts
1978 through 1986 150 cu in 4-Cylinder, Inline 6-Cylinder & V8 Engines6 Volts
Distributor Ignition Pickup Coil Resistance
1974 through 19771.6 to 2.4 ohms
1978 through 1986 150 cu in 4-Cylinder, Inline 6-Cylinder & V8 Engines400 to 800 ohms
1980 through 1983 4-Cylinder Engine
Pickup Connector500 to 800 ohms
Connector-to-GroundInfinity

Conventional Ignition System
Cranking Voltage
6-Volt System4.5 Volts
12-Volt System9 Volts
Voltage Drop Test
Battery Cable-to-Starter0.2 or less
Distributor Primare Terminal on the
Coil-to-the Primary Terminal on the Distributor
0.05 or less
Distributor Coil Terminal-to-Distributor Body0.05 or less

Starting System
1953 through 1972 ModelsBrush Spring Tension
Autolite 6-Volt42 to 53 oz
Autolite 12-Volt31 to 47 oz
Delco 6-Volt24 oz
Delco 12-Volt
MDM-6005, MDU-700431 to 47 oz
110774635 oz
1107391, 108366 and 110837532 to 40 oz
Perstolite32 to 40 oz
1973 through 1986 Models150 cu in 4-Cylinder, In-Line 6-Cylinder & V8 Engines Only
Brush Spring Tension40 oz
Brush Length1/2 in
Brush Wear Limit1/4 in

Torque SpecificationsFt-lbNm
Alternator Bracket-to-Engine23 to 3031 to 41
Alternator Pivot Bolt23 to 3031 to 41
Starter Motor-to-Bellhousing15 to 2021 to 28