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I have a Miller trailblazer 251. From the label it is somewhere around 1998. I can provide any specific info if it helps!The welder/generator starts and runs, and idles with no issue. Welds perfectly through the entire range. The problem I amhaving is it will not idle up when a load is applied. Doesn’t matter if I am welding or using the generator. first things first I am not an electrician, engineer, or someone who can diagnose or read the wiring diagrams. I am simply looking for a starting point or directions of what I should do. I know it is absolutely wrong to come and ask experts when I should be more versed, but I’m hoping someone in here can help.Please help!
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Originally Posted by [email protected]

I have a Miller trailblazer 251. From the label it is somewhere around 1998. I can provide any specific info if it helps!The welder/generator starts and runs, and idles with no issue. Welds perfectly through the entire range. The problem I amhaving is it will not idle up when a load is applied. Doesn’t matter if I am welding or using the generator. first things first I am not an electrician, engineer, or someone who can diagnose or read the wiring diagrams. I am simply looking for a starting point or directions of what I should do. I know it is absolutely wrong to come and ask experts when I should be more versed, but I’m hoping someone in here can help.Please help!
Reply:I can manually switch it from run/idle to run and it handles any load. I can ditch it to run/idle and it runs and idles down properly. It just won’t idle up automatically when a load is applied.yes I have access to the manual but doesn’t tell me anything. It gives wiring diagrams and parts diagrams but no troubleshooting.
Reply:

Originally Posted by [email protected]

I can manually switch it from run/idle to run and it handles any load. I can ditch it to run/idle and it runs and idles down properly. It just won’t idle up automatically when a load is applied.yes I have access to the manual but doesn’t tell me anything. It gives wiring diagrams and parts diagrams but no troubleshooting.
Reply:I really appreciate any help I can get. No I have not solved the problem yet. I cannot figure it out.
Reply:I don't know about that machine but most don't "idle up" with a load other then when welding. When welding it will start at low idle and then go up to welding rpm but rpm shouldn't change much while actually welding. With the generator side it should hold a pretty constant rpm when a load is applied. Fuel/ air, horsepower/ torque will increase to handle the heavier load but rpm shouldn't change. Have you checked the rpm to see what it's at before and after a load is applied?Airco Ac/Dc 300 HeliwelderMillerMatic 200 (stolen)Miller Maxstar 150STLMiller AEAD200LE (welding and generating power

) Hobart MIG
Reply:Finding and visually checking the current transformer, idle circuit board and throttle solenoid would be a good start.Current transformer- usually a ring placed around a large wire.                                Ring has smaller wire wrapped around it.Idle circuit board-       Smaller than main circuit board. Connected                                  to current transformer  Throttle solenoid-      On or linked to carburetor, powered by idle circuit board. Current transformer senses rise in current in large wire,sends signal to idle board. Idle board sends power tosolenoid which throttles up engine. This is how my Hobart works and from the looks of theTrailblazer schematic I found  , yours should be the same.If you look at the schematic online you may get help through wire numbers and other info.  The next step would be checking above components with amultimeter.Miller a/c-d/c Thunderbolt XLMillermatic 180 Purox O/ASmith Littletorch O/AHobart Champion Elite
Reply:I would look at reed sensor switch.I could be bad or not connected correctly. Dave

Originally Posted by [email protected]

I have a Miller trailblazer 251. From the label it is somewhere around 1998. I can provide any specific info if it helps!The welder/generator starts and runs, and idles with no issue. Welds perfectly through the entire range. The problem I amhaving is it will not idle up when a load is applied. Doesn’t matter if I am welding or using the generator. first things first I am not an electrician, engineer, or someone who can diagnose or read the wiring diagrams. I am simply looking for a starting point or directions of what I should do. I know it is absolutely wrong to come and ask experts when I should be more versed, but I’m hoping someone in here can help.Please help!
Reply:No reed switch on the Trailblazer.  My guess is a bad Current Transformer (CT), connection or bad idler module.I have idler module/CT troubleshooting info but the file size is too large to post to the forum and I'm having email issues and can't send it.

MM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110

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Reply:Actually, here's some of the information that I can post.Information on CT troubleshooting from Miller Customer Service originally posted by another member in the past:The engine speeds need to be set correctly first, as engine speed is very critical for proper system operation. If the speeds are set correctly, and all connections, grounds, and pin terminals appear to be good, then troubleshooting of the CT1 can be done.With an AC volt meter connected to terminals "G" and "E" at the idle module, start the machine. When applying either an auxiliary power load (such as a 100 watt light bulb) at the receptacles, or striking an arc you should see a minimum of 1 AC volt on your volt meter that is connected to terminals "G" and "E" at the idle module.If you don't see any AC voltage with a load on the engine, it would be recommended to check for a bad crimp connection at a terminal, corrosion, broken wire or open circuit on the current transformer.

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Trailblazer 251 Idler Troubleshooting pg1.pdf (97.9 KB, 1 views)MM200 w/Spoolmatic 1Syncrowave 180SDBobcat 225G Plus - LP/NGMUTT Suitcase WirefeederWC-1S/Spoolmatic 1HF-251D-1PakMaster 100XL '68 Red Face Code #6633 projectStar Jet 21-110

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