April 28, 1961
Bulletin No. SB-844
Ignition Systems
SUBJECT: Testing battery ignition coil #378231 on old style
Stevens Coil & Condenser Tester containing ammeter,
neon glow tube, and spark gap electrodes;
75 h.p. alternator models V4A & V4AL-13 thru 13F.
This bulletin is written for the benefit of those dealers who are using the
subject Stevens Coil & Condenser Tester.
Testing battery ignition coil #378231 used on the alternator equipped engines
can be accomplished on Stevens' old style Coil & Condenser Tester by making
connections as follows below. NO SPECIAL TEST ADAPTOR OF ANY KIND IS REQUIRED
WITH THIS TESTER!.
A. TESTING COIL ON THE ENGINE:
1. ALWAYS DISCONNECT THE PRIMARY WIRES FROM COIL TO INSURE AN ACCURATE COIL TEST.
2. Connect black primary lead (ground) to negative (-) terminal of coil.
3. Connect black high tension lead from center electrode post (ground) to
same terminal as specified in step 2, (negative (-) terminal of coil).
4. Connect red primary lead (hot) to positive (+) terminal of coil.
5. Connect a red high tension spark gap lead to secondary circuit (tower)
of coil.
6. Adjust switch setting and ampere value as follows:
COIL NO. SWITCH SETTING AMPERES
378231 A 1.0 - 1.5
7. Test coil in the conventional manner.
B. TESTING COIL OFF THE ENGINE (bench testing):
1. Test as outlined under steps A2 through 7.
Condensers are tested in the conventional manner as described on page 23 of
General Service Manual #302231, or as contained in the instructions provided
with each testing unit.
JOHNSON MOTORS
W. W. DeWees
Service Department
WWD:eb
NOTE: Post on your V-75 index.
