1964 – 1965 Diagnosis ENGINE HARD START OR WILL NOT RUN CONDITION

Reconnect spark plug lead. The problem is not in the primary circuits. Check fuel system, starting circuit, carburetion, also check secondary circuit as described under “Engine Surge or Erratic Miss Condition.”

1. Reconnect spark plug lead.
2. Connect a tachometer between coil positive (+) terminal and the black/pink wire at the 3-wire connector on left side of firewall.
3. Place selector on 1000 R.P.M. scale, then crank the engine and look for tachometer deflection.

Choose one of the following:

NO DEFLECTION

Make the following tests to determine location of open, short, or abnormally high resistance in circuit.

CIRCUIT RESISTANCE TEST
(Using Voltmeter)

1. Connect voltmeter between ignition coil positive (+) terminal and a good ground location.
2. Turn ignition switch to “ON” position and observe voltmeter reading.

Choose one of the following:

• 0 VOLTS

Indicates an open in ignition circuit between the battery positive terminal and the coil positive terminal. If connections are good, insert a jumper lead between the black/pink and the black lead at amplifier connector.

READS 0 VOLTS
Indicates an open in the harness to amplifier unit. Repair or replace the harness.

READS 5-7 VOLTS
Indicates open in amplifier unit. Replace amplifier.

• 0-5 VOLTS

Indicates high starting by-pass resistance or high amplifier resistance. Move voltmeter lead from coil positive to black/pink wire at 3-terminal connector at firewall (use test prod).

METER READS OVER 7 VOLTS
Resistance in amplifier too high – replace amplifier.

READS LESS THAN 6 VOLTS
Resistance too high in starting by-pass wire. (Spec.: approx. 0.7 ohm)

• 5-7 VOLTS

This is the correct reading, however, when obtained at this stage of the check on a system that has not been functioning properly it would indicate improper triggering action of the distributor pickup coil or amplifier unit. Perform DISTRIBUTOR CHECK.

Check performance of the distributor pickup coil and the amplifier unit by employing either of the test methods described below.

OHMMETER METHOD

1. Detach distributor connector body from harness connector, and connect an ohmmeter to the distributor leads.
2. Slowly rotate magnetic pickup assembly through full advance travel and read ohmmeter. If reading is not within 500-700 ohms replace pickup assembly.
3. If the reading is within the 500-700 ohm range, disconnect one ohmmeter lead and connect to ground.
4. If reading is less than infinity, replace magnetic pickup assembly.
5. If reading is infinite, replace the installed amplifier unit.

Note: Components of the ignition pulse amplifier unit are not serviced separately – only the complete amplifier unit is available for service replacement.

DISTRIBUTOR SUBSTITUTION METHOD

1. Detach distributor connector body from harness connector and connect a spare distributor to the harness connector.
2. Connect a tachometer between coil positive terminal and the black/pink wire at the 3-wire connector on the left side of firewall.
3. With the ignition switch “ON,” turn distributor shaft by hand and observe tachometer.
4. If tachometer needle deflects, replace magnetic pickup assembly in distributor installed in engine.
5. If there is no needle deflection, replace the installed amplifier unit.

Note: Components of the ignition pulse amplifier unit are not serviced separately – only the complete amplifier unit is available for service replacement.

• 7-11 VOLTS

Indicates high resistance through coil and ground resistance wire. Move the voltmeter lead from the coil positive to the coil negative (-) terminal.

METER DROPS TO 3 VOLTS
Ignition coil resistance high – replace.

DROPS TO 4-8 VOLTS
Resistance wire has too high a value – replace. (Spec.: approx. 0.45 ohm)

• BATTERY VOLTAGE (11-12 VOLTS)

Indicates open in primary circuit. Move voltmeter lead to negative coil terminal.

METER DROPS TO 0 VOLTS
Indicates an open primary circuit in ignition coil. Replace coil.

STAYS AT 11-12 VOLTS
Indicates open in ground resistor wire or connections. Repair or replace harness.

DEFLECTION

Pin point the system trouble by performing “Ignition Distributor Check”.
OHMMETER METHOD

1. 1. Detach distributor connector body from harness connector, and connect an ohmmeter to the distributor leads.
   2. Slowly rotate magnetic pickup assembly through full advance travel and read ohmmeter. If reading is not within 500-700 ohms replace pickup assembly.
   3. If the reading is within the 500-700 ohm range, disconnect one ohmmeter lead and connect to ground.
   4. If reading is less than infinity, replace magnetic pickup assembly.
   5. If reading is infinite, replace the installed amplifier unit.

Note: Components of the ignition pulse amplifier unit are not serviced separately – only the complete amplifier unit is available for service replacement.

DISTRIBUTOR SUBSTITUTION METHOD

1. 1. Detach distributor connector body from harness connector and connect a spare distributor to the harness connector.
   2. Connect a tachometer between coil positive terminal and the black/pink wire at the 3-wire connector on the left side of firewall.
   3. With the ignition switch “ON,” turn distributor shaft by hand and observe tachometer.
   4. If tachometer needle deflects, replace magnetic pickup assembly in distributor installed in engine.
   5. If there is no needle deflection, replace the installed amplifier unit.

Note: Components of the ignition pulse amplifier unit are not serviced separately – only the complete amplifier unit is available for service replacement.