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6Y-12 ENGINE ELECTRICAL
3 WAY CONNECTOR
, . Z I E M ._
2 WAY CONNECTOR
GREEN LEAD
WHITE LEAD
MODULE GROUND
TERMINAL
A-6177
Figure 6-Check No . 3 with-J-24642-1 01
install any good spark plug with .080 gap in
lead and lay on engine block while cranking
engine .
6 . If sparking occurs trouble is not ignition
distributor . Check fuel system and spark plugs .
Check timing . Distributor may have shifted .
7 . If no spark, make test No . 1 with Module
Tester J-24642 or equivalent .
TESTING TESTER J-24642
Before module tester J-24642 is used, proper
operation of the tester can be verified by the
use of special tool J-24642-101, Tester Verifi-
cation Kit.
The series of checks in the verification
procedure are performed with the following
items:
1 . A
test resistor-connector J-24642-101
(100 Ohms
±5D/D,
2 Watts) .
2 . A known good HEI module .
3 . A
fully
charged
12-volt
automotive
battery .
4 . A jumper wire (18 ga . x 20" is adequate)
5 . The J-24642 tester .
Check No . 1
1 . Connect the tester's battery cable to a
fully charged automotive battery (11-1/2 - 12-
1/2 volts), with red lead of tester to battery
positive terminal (+) and black lead of tester
to battery negative terminal
Make no
other connections to the tester.
Observe
both
indicator
lights.
If
either or both lights are on, the module tester
is defective.
2 . Press the "TEST" button and observe the
lights .
RED "REPLACE" light should come
on and stay on .
GREEN "GOOD" light should remain
off .
The tester is defective if these two
conditions are not met .
Check No. 2
1 . Connect the tester and a known good HEI
module in the following manner:
A . Connect the two-way connector of
the tester to the module .
B . Connect the green and white tester
leads to the corresponding "G" and
"W" terminals of the module.
C. Connect red lead of tester to 12-volt
automotive
battery
positive
(+)
terminal and black lead of tester to
battery negative (-) terminal.
D . Connect ground lead of tester to HEI
module ground terminal . The module
ground is located at the mounting
screw
hold-down
nearest
two-way
connector terminals.
2. Press "TEST" button and observe the
lights .
RED "REPLACE" light should come
on momentarily and then go out.
GREEN "GOOD" light should come on
and stay on.
If not, the tester is defective .
Check No. 3
1 . To the setup of Check 2, add a jumper
wire connecting the "W"
and
ground "G"
terminal of the module as shown in figure 6 .
NOTE: Do not connect the jumper from the
"G" terminal of the HEI module to ground as
damage to the tester will result .
2 . Press "TEST" button and observe the
lights.
Red "REPLACE" light should come on
and stay on as long as button is held
down.
Green "GOOD" light should remain
off .
Tester
is
defective
if
these
two
conditions are not met .
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