rivercreek
Member
- 101
- 1
- 18
- Location
- Berryville, VA
I'll preface with an apology. I know that there have been more glow plug questions than probably any other subject in this forum. I've spent the last two hours thread cruising with no clear solution to or explanation of my particular problem. Facts: 88' M1008. 12V conversion complete months ago, suddenly glow plugs inop. After testing, found bad GP relay. No big deal - replaced relay, truck starts right up. Job well done, I say to self. While spraying new relay connections with terminal protector prior to closing the hood and calling it a day, notice burnt smell (perhaps not suprisingly like burning plastic) and smoke inside cab. I immediately shut truck off, grab 9/16" wrench and proceed to remove + battery cables from all 3 batteries in what I believe to be world record speed. Death by fire averted, I grab flashlight and pretzel myself under dash to see what's cooking. Glow plug controller toasted like an overcooked hot pocket. Both chips on board fried. Current status: 1). Shop smells like a still wrapped toaster strudel got tossed in an oven set on broil and forgotten about. 2). All shop doors open to eliminate aforementioned cooked while wrapped and forgotten about burnt strudel stank - it's cold, increasingly windy, and raining. 3). Self pissed right off. I understand this isn't the place to write novels, but I needed to vent a bit (literally). That said, continuation of facts as follows:
1). GP controller is obviously removed from truck at present.
2). Glow plugs receiving 12V power with ign on.
3). Relay is not activating (No power with or without ign on from orange wire output). 12V+ battery current is present at top post of solenoid.
4). With ign off, both blue and pink (signal) wires to solenoid are grounded. With ign on, both blue and pink wires to solenoid are hot.
4). With 12V+ battery input to GP solenoid REMOVED from solenoid, still receiving 12V power to glow plugs with ign on.
Thus my quandry. When I first discovered GP controller was char-broiled, I said to self: “Self, screw it. Replace that stupid half baked idiotic stinky controller with a manual momentary like you’ve read 197, 472 times on Steel Soldiers. All you have to do is ground the blue wire through a switch, and here you are getting yourself all worked up over one measly and unnecessary $150.00 glow plug controller… Weeell, as usual, the plot thickens.. I do not understand how the above is possible. According to the schematic, it appears that the only route for power to the glow plugs is through the GP solenoid. Power has certainly bypassed that, as all four wires that are supposed to be attached to it are currently flapping in the increasingly cold wind blowing through my shop at present while the only toasty thing in the vicinity appear to be 8 little glow plugs that have found some magic invisible 12V power source. I cannot locate any areas of burnt wire harness where perhaps something is shorting, besides the fact that the battery power to the GP relay is fused at 30A (Didn’t blow). Anyone have any ideas ??
1). GP controller is obviously removed from truck at present.
2). Glow plugs receiving 12V power with ign on.
3). Relay is not activating (No power with or without ign on from orange wire output). 12V+ battery current is present at top post of solenoid.
4). With ign off, both blue and pink (signal) wires to solenoid are grounded. With ign on, both blue and pink wires to solenoid are hot.
4). With 12V+ battery input to GP solenoid REMOVED from solenoid, still receiving 12V power to glow plugs with ign on.
Thus my quandry. When I first discovered GP controller was char-broiled, I said to self: “Self, screw it. Replace that stupid half baked idiotic stinky controller with a manual momentary like you’ve read 197, 472 times on Steel Soldiers. All you have to do is ground the blue wire through a switch, and here you are getting yourself all worked up over one measly and unnecessary $150.00 glow plug controller… Weeell, as usual, the plot thickens.. I do not understand how the above is possible. According to the schematic, it appears that the only route for power to the glow plugs is through the GP solenoid. Power has certainly bypassed that, as all four wires that are supposed to be attached to it are currently flapping in the increasingly cold wind blowing through my shop at present while the only toasty thing in the vicinity appear to be 8 little glow plugs that have found some magic invisible 12V power source. I cannot locate any areas of burnt wire harness where perhaps something is shorting, besides the fact that the battery power to the GP relay is fused at 30A (Didn’t blow). Anyone have any ideas ??
