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Ignition Primary

NOTE: Perform SECONDARY SPARK under IGNITION CHECKS before proceeding with test.
  1. Ensure battery has a minimum of 12.5 volts (9.5 cranking volts) available to operate cranking system. Ensure battery cable connections are clean and tight.
  2. Using an analog voltmeter, backprobe the following wires at the distributor. Touch positive lead to Tan/Yellow wire (Gray/Black wire on Wrangler). Touch negative lead to Black/Blue wire (Brown/Red wire on Wrangler.
  3. Set voltmeter to 15-volt DC scale. Crank engine. If voltmeter needle does not fluctuate between 0-5 volts, check related circuits. If necessary, replace sync pulse generator. If sync pulse generator is okay, but engine does not start, see appropriate TESTS W/CODES article in the ENGINE PERFORMANCE Section and check SBEC-II.
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