1988 "CC" Colt / Junior thru 8 Models Service Manual, P/N 507659, Page 149Get this manual
Cranking Output Tests Using C.DVoltmeter Deluxe thru 8 All cranking output tests must be performed with spark plugs installed and torqued in the cylinder headIf necessary to remove the spark plugs, be sure to keep the spark tester away from open spark plug holes
Step Total Output Test
Before making cranking output tests, perform total output test
ARemove the high tension leads from both spark plugsTo prevent damage to the spring terminal on the high tension lead, twist and pull the cover
BAdjust the spark gap on the spark tester to in(12 mm)Connect the tester leads to the high tension leadsSecure tester clip to clean engine ground