C 10 1/2 Ton Pickup 2WD V8-305 5.0L VIN H 4-bbl (1982)
Choke Thermostat/Heater: Testing and Inspection
Fig. 29 - Electric Choke Assembly
Possible Causes For Improper Electric Assist Choke Operation:
1. Low or no engine oil pressure.
2. Oil pressure switch faulty.
3. No current to oil pressure switch due to:
a. "Radio-idle stop" fuse burned out--15 amp.
b. Oil pressure switch circuit open--broken wire.
4. No current between choke and oil pressure switch due to:
a. Broken (18 light blue) lead wire.
b. Coil terminal not properly secured.
c. Faulty choke assembly to housing grounding plate ground circuit.
5. Choke coil assembly faulty.
NOTE: A voltmeter should be used to check oil pressure and choke coil circuits.
If choke coil assembly is a suspected problem, perform the following test:
1. Remove choke coil from carburetor and allow coil to cool to room temperature.
2. Connect a "jumper" wire between the positive battery terminal and choke coil terminal assembly.
3. Connect a second "jumper" wire between the negative battery terminal and the choke coil assembly grounding plate.
4. The tang on the choke coil should rotate 45° in 54-90 seconds.
5. If choke coil does not rotate or exceeds the 54-90 second time limit, replace choke coil.
6. If coil is within specification, check steps 1 through 5.
