DieselWarrior
1/2 ton status
Does anyone have a pinout for the glow plug controller?
('82 K5 Blazer 6.2L)
Thanks!
Andrew
CK5
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Need pinout for 6.2 glow plug controller
- Thread starter DieselWarrior
- Start date
Does anyone have a pinout for the glow plug controller?
('82 K5 Blazer 6.2L)
Thanks!
Andrew
I have a diagram in my Haynes manual,but no way to post it up here...
Try Autozone.com--they have tech info links on their website that you can download wiring diagrams from--their stores can also give you a printout of one off their computers,I think its like Alldata or similar info site they use...
Try Autozone.com--they have tech info links on their website that you can download wiring diagrams from--their stores can also give you a printout of one off their computers,I think its like Alldata or similar info site they use...
DieselWarrior
1/2 ton status
Is this the book? If so I have the same. What page please? I looked and looked, never saw it and still cant find it!
Thanks for replying!
Andrew
Indy4x4Fab
1/2 ton status
i have a spare one of these controller if u need it. ill never use it.
DieselWarrior
1/2 ton status
Thanks a million Indy... Lemme do more checking before I give up. Rene (tRustyk5) just mailed me, reminded me to check the chassis to block ground strap... I did notice last night it was NOT connected... lemme slice off a piece of spare time and put it back and see if that solves the problem before I take you up on that!
Worse case, I am planning a build of a PIC microcontroller based glow plug controller for the 6.2/5 that should offer greater features and servicability than the OEM. Thats the reason I am hunting down the OEM GP pinout.
I dont even know which pin is #1 so I cant follow any of the diagnostic steps in the Haynes book...
Thanks all,
Andrew
Indy4x4Fab
1/2 ton status
ok just let me know.
Sorry,I goofed--I have a "Clymer" manual with the wiring diagram in it 
..
I cant even READ it without a magnifying glass and a 100W bulb,and I have noneat hand ...
...and I dont have a clue on how to upload a scanned photo of it either....hope you had some luck in the Autozone site...if you have no luck let me know and I'll try to see if I can read it for you..my eyes are screwed,I think I have cataracts...
..I cant even READ it without a magnifying glass and a 100W bulb,and I have noneat hand ...
...and I dont have a clue on how to upload a scanned photo of it either....hope you had some luck in the Autozone site...if you have no luck let me know and I'll try to see if I can read it for you..my eyes are screwed,I think I have cataracts...
I have the GM 6.2 book here. Not sure if it'll help, but these are a couple of pages that might clear stuff up.
Rene
Rene
DieselWarrior
1/2 ton status
Okay, Rene's diagram is some help, plus in the Haynes book it does show the pin numbers, finally found it last night.
However, what I am really after is, what does pin 1 do? Pin 2? etc..
However, what I am really after is, what does pin 1 do? Pin 2? etc..
I can tell you the light blue wire from the controller is the key to it all. When that wire gets ground the GP's will light. If the heaters within the controller are under the temp values the light blue wire will be 'ground'.
I am still betting the ground strap is your issue.
Rene
I am still betting the ground strap is your issue.
Rene
cdoggwsu
1/2 ton status
From justanswer.com:
1982---84 Models
The Glow Plug Control System - Consists of a thermal controller, a glow plug relay, 6 volt glow plugs and a glow plug warning lamp, Fig. 5.
The Thermal Controller - Mounted in the water passage at the rear of the engine controls glow plug ooperation using thermostatic elements within the controller which open or close the ground circuit to the glow plug relay as necessary.
The Glow Plug Relay - Located on the left inner fender panel, provides current to the glow plugs as long as the thermal controller completes the ground circuit.
The 6 Volt Glow Plugs--Used in This 12 Volt System - Are pulsed ON and OFF by the glow plug relay in response to messages received by the controller to prevent damage to the glow plugs.
The Glow Plug Warning Lamp - Mounted in the instrument cluster, and wired across the glow plugs, illuminateds whenever the glow plugs are heating.
Cold Starting
Initially, during cold starting, the glow plugs are activated continuously for 71/2---9 seconds at 0°F.
Engine Warm-up
The glow plugs then pulse on and off at a rate determined by the thermal characteristics of the controller, to provide stable engine warm-up.
As the engine warms up the controller turns off all current to the relay, de-energizing the glow plugs.
In Addition
The controller is capable of varying glow plug operation as needed to allow proper operation during cold starting when little or no heating is required.
In the Event of Controller Failure
A circuit breaker within the controller opens and current to the glow plugs is cut off in the event of controller failure--as in the case of prolonged preheat.
1982---84
Disconnect electrical connector from thermal controller.
Measure resistance between controller terminals using high impedance, digital ohmmeter set on 200 ohms scale.
Resistance should be as follows:
Pins 2 to 3 ................0.40---0.75 ohms
Pins 4 to 5 ....................24---30 ohms
Pins 1 to 5 ..................117---143 ohms
Pins 2 to 6 .............Continuity (0) ohms
If resistance values are not as specified, controller is defective.
If resistance values are within specifications, reconnect electrical connector and observe controller operation with ignition key in on position and engine stopped.
If controller cycles more than one time, controller is satisfactory.
If controller cycles only once, check for a short or open in harness as outlined in ``System Diagnosis.''
If all other components are satisfactory, but controller cycles only once in step 5, replace controller and recheck system operation.
1982---84 Models
The Glow Plug Control System - Consists of a thermal controller, a glow plug relay, 6 volt glow plugs and a glow plug warning lamp, Fig. 5.
The Thermal Controller - Mounted in the water passage at the rear of the engine controls glow plug ooperation using thermostatic elements within the controller which open or close the ground circuit to the glow plug relay as necessary.
The Glow Plug Relay - Located on the left inner fender panel, provides current to the glow plugs as long as the thermal controller completes the ground circuit.
The 6 Volt Glow Plugs--Used in This 12 Volt System - Are pulsed ON and OFF by the glow plug relay in response to messages received by the controller to prevent damage to the glow plugs.
The Glow Plug Warning Lamp - Mounted in the instrument cluster, and wired across the glow plugs, illuminateds whenever the glow plugs are heating.
Cold Starting
Initially, during cold starting, the glow plugs are activated continuously for 71/2---9 seconds at 0°F.
Engine Warm-up
The glow plugs then pulse on and off at a rate determined by the thermal characteristics of the controller, to provide stable engine warm-up.
As the engine warms up the controller turns off all current to the relay, de-energizing the glow plugs.
In Addition
The controller is capable of varying glow plug operation as needed to allow proper operation during cold starting when little or no heating is required.
In the Event of Controller Failure
A circuit breaker within the controller opens and current to the glow plugs is cut off in the event of controller failure--as in the case of prolonged preheat.
1982---84
Disconnect electrical connector from thermal controller.
Measure resistance between controller terminals using high impedance, digital ohmmeter set on 200 ohms scale.
Resistance should be as follows:
Pins 2 to 3 ................0.40---0.75 ohms
Pins 4 to 5 ....................24---30 ohms
Pins 1 to 5 ..................117---143 ohms
Pins 2 to 6 .............Continuity (0) ohms
If resistance values are not as specified, controller is defective.
If resistance values are within specifications, reconnect electrical connector and observe controller operation with ignition key in on position and engine stopped.
If controller cycles more than one time, controller is satisfactory.
If controller cycles only once, check for a short or open in harness as outlined in ``System Diagnosis.''
If all other components are satisfactory, but controller cycles only once in step 5, replace controller and recheck system operation.
Last edited:
Awesome find Chris! 
Rene
Rene
cdoggwsu
1/2 ton status
Thanks, I hope it helps. That's a hell of a circuit, I had no idea the controller was that "smart". I figure it was just a glow x if this temp, glow y if this temp...
Yeah, it certainly looks at more than that...
I found out about how it needs to see charging voltage in order to stop the glow plugs from cycling when my alt belt blew off and I had to drive home from work with no alt. Glow plugs cycled on and off all the way home. Sure put a hurt on my batteries!
Rene
I found out about how it needs to see charging voltage in order to stop the glow plugs from cycling when my alt belt blew off and I had to drive home from work with no alt. Glow plugs cycled on and off all the way home. Sure put a hurt on my batteries!
Rene
