Matchbox Testing

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How to test your 1978-1982 factory Datsun "matchbox" distributor, from the Nissan factory service manual.

For B310 Electronic Distributor Swap
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Manual Testing

A volt-ohn-milliammeter (VOM) may be used to diagnose transistor ignition malfunctions.

Use this scale:
DC: 20V
Ohms: 1000
AC: 10V
Ohms: 50,000

If possible test with components at operating temperature -- this will help find intermittent problems that only occur when the parts are HOT.

It is not necessary to disconnect the harness connectors when performing the following tests.

Power Circuit

= Not Running

1. IGN key ON, engine not running
2. connect Voltmeter (20V scale) between distributor case and the "B" connection (stem of T)

Results:

• below 11.5 volts. Problem. Check fuse and wiring
• 11.5 - 12.5 volts. This test OK. Complete other tests

= Cranking

1. Pull coil wire from cap and ground it
2. connect Voltmeter (20V scale) between distributor case and the "B" connection (stem of T)
3. Crank engine (key at START)

Results:

• Voltage more than 1V below Battery cranking voltage (or below 8.6V). Check ignition switch, fuse and wiring
• Voltage close to battery cranking voltage (no more than 1V less) AND better than 8.6V. This test is OK. Complete other tests.

7 Ignition Primary Circuit

1. IGN key ON, engine not running
2. connect Voltmeter (20V scale) between distributor case and the "C" connection (head of T)

Results:

• below 11.5 volts. Problem. Proceed with Test 8
• 11.5 - 12.5 volts. This test OK. Proceed with Test 9

8 Coil Primary Circuit

1. Key OFF
2. coil wire removed from coil