Group 12 Engine Electrical Index
Alternator - Bearing, replace
Alternator - Carbon brushes, replace
Alternator - Diode plate, replace
Alternator - Disassemble and assemble
Alternator - Voltage regulator, replace
Diagnostic connector - Pin layout
Distributor - Cap and Rotor, remove
and install
DME - Engine control unit, remove and
install
DME - Engine electronics
system description
Ignition Coil - Check or replace
Spark Plug - Wires, repair
Starter Motor - Operating
principles
Starter Motor - Remove and Install
Starter Motor - Troubleshooting
Important information for working on transistorized ignition systems and Digital Motor
Electronics (DME)
 | Always disconnect battery or interrupt power supply to ignition control unit and
ignition coil when working on the electrical system (charging battery or welding, etc.)
Dangerous primary and secondary voltage can occur, causing injury, or more likely, damage
to electronic components.
|
| Never crank engine with coil lead disconnected unless lead is grounded, or DME is
disconnected.
|
| Never disconnect the battery or alternator leads while the engine is running.
|
| Never connect wire of ignition coil terminal 1 to ground or B+. Also, never install an
anti theft system that breaks the wire to terminal 1 of the coil as a kill switch.
|
| When performing compression check, disconnect DME or remove Main Relay
|
| The secondary side (high voltage side) of the ignition system must be shielded
with at least 4K Ohms. Always use a distributor rotor of original specification of 1 K
Ohm. Do not use a higher resistance rotor to solve radio interference. Use suppressers
instead.
|
| Always completely disconnect any component or harness before checking with an Ohm meter,
or value will be incorrect. |
