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ENGINE-ELECTRICAL 6Y-13
F
2
3
4
f
2
3
4
F
2
3
4
Fig. 10c—Initial Field Excitation Circuit Tests
connect to "F" terminal on D e l c o t r o n (fig. 10c,
Step 3), and note lamp:
a. Lamp glows-an open circuit in wire between "F"
terminals—correct as needed.
b. Fails to glow—Delcotron field has open circuit,
see "Service Operations" to repair
%
If Lamp Fails to Go Out, or if Ammeter Shows
Discharge the Possible Causes are:
1. Loose drive belt—adjust as necessary.
2. Faulty field relay—(see relay test and adjustment).
3. Defective Delcotron—(see Delcotron output test).
4. At normal idle—parallel resistance wire open (see
Resistance test). On ammeter models the initial
field excitation wire to "ACC" terminal is open.
5. Switch off—positive diode shorted (see Diode test).
FIELD CIRCUIT RESISTANCE
WIRE CHECKS
The resistance wire is an integral part of the ignition
harness. However, the resistance wire is not solderable;
it must be spliced with a crimp-type connector. It is
rated at 10 ohms, 6.25 watts minimum.
The check for an open resistor or field excitation wire
(connected to the ignition switch "ACC" terminal) is as
follows:
1. Connect a test lamp from the wiring harness con-
nector terminal "4" to ground as shown in Figure
10c (Step 1).
2. Turn the ignition switch to the "ON" position and
note test bulb.
a. Test lamp glows—resistance is O.K.
b. Test lamp does not glow—the resistor is open
circuited—note also that dash lamp does not glow
during this test because series resistance of the
2 bulbs causes amperage to be too low.
VOLTMETER
3
4
WIRING* HARNESS
CONNECTOR
Fig. 11c—Testing Field Relay
CHEVROLET CHASSIS SERVICE MANUAL
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