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Old 07-14-2015, 07:53 PM   #1
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Tradewinds Generac run problems......

Generac run problems
My series NP-80D, Model 9344-1, diesel Generac will start but will not continue to run when I release the pre-heat button. If I press the pre-heat button, before it completely stops, it continues to run......and will run as long as I press the preheat button. What is the likely cause for this? Rook
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Old 07-14-2015, 10:06 PM   #2
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I think that I was told that the preheat button is also the fuel pump button and that you need to hold the button for between 15 to 30 seconds when starting. I have also had that problem and held the button for as much as a minute. On the other hand, it's possible that there is something wrong with either the switch or the fuel pump.
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Old 07-15-2015, 09:40 AM   #3
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Fuel pump stops running.....

I have verified that the oil pressure sensor and the water temp sensor are not the problem.....they are good. And the oil is on "full". So, here is what I now see......pressing the pre-heat button turns on the glow plugs and the fuel pump (makes a putting sound) and then I press the Start switch and the engine starts and will run as long as I continue to hold the pre-heat button on.......when the pre-heat button is released, the engine stops because the fuel pump stops running. Something is supposed to keep the fuel pump running, even after releasing the pre-heat button, but doesn't. I have a wiring diagram and an electrical schematic, but haven't figured it out yet.

Any Generac Techs out there? Frustrating! Rook
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Old 07-18-2015, 05:35 PM   #4
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Hooray, Hooray......problem found

After days and days of searching, I found a FREE, downloadable, SERVICE Manual for my specific model of Generac Diesel Generator......it has wiring diagrams, schematics and troubleshooting guides, even step-by-step testing procedures, 152 pages in all.....great! I followed the directions for my version of Control Board (there are 3 versions) and determined that I had a bad Control Board......I learned a lot about the operation of this Generator. I think all Generac models are similar. Many electrical components and parts are the same.....only the engines are different. A new Board is on order, $288.00. I will post the results when I get it installed. Fingers crossed! Rook
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Old 07-19-2015, 11:36 PM   #5
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Good find Rook.
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Old 07-21-2015, 06:15 PM   #6
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Well, after discovering a place that does board repair on Generac, and other Mfg's, for a flat rate of $125.....I cancelled my order for a new Control Board and sent my Board to them. Two phone conversations with their Generac Control Board Tech convinced me. Stay tuned for the results. Rook
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Old 08-01-2015, 06:13 PM   #7
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OK, got my Control Board back and installed it, all 24 wires! BTW, if you EVER do this, make sure you label the wires and tape the ID with durable sticky tape. Uh, hmmm.....ask me why I say this! Good news, my diesel starts and continues to run. ....and the alternator side seems to be good as well. I had to adjust the voltage regulator a bit to get the 124VAC factory recommended. Next test....will the transfer switch switch over to the Generator?! Tomorrow, we will know! Rook
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Old 08-04-2015, 06:48 PM   #8
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Drats......%$#@&*^%, went out to start my Generator to test my Power Transfer Switch to see if it transferred to the Genny and "to my disbelief" The genny will not run....it starts, but will not continue to run when I release the start button....,UNBELIEVABLE! Same problem as before! UGH! Hard to believe @#$%^&*...... ROOK
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Old 08-05-2015, 07:01 AM   #9
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Shock Recovery......

OK, after mumbling, grumbling and sulking overnight, my disbelief has faded a bit and REALITY has set in. One observation out of all of this is, my 3 cly diesel engine is not a smooth running motor.....it vibrates a lot.....I assume it is typical for a 3 cly diesel. Realizing that, Generac mounted the big Control Box on 4 rubber feet right on top of the Alternator, to help reduce the "shock" to the components in the box. However, it stills shakes a lot, amplified by the rubber feet it is mounted on. Why did I say all of this? I am suspicious that I may have an intermittent short to the grounded box where the wires from the Alternator come through the bottom of the control box.......that will be my first check..... ROOK (the pending Generac expert)
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Old 08-05-2015, 06:03 PM   #10
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Persistance wins again......

Hooray, Hooray....success at last. I'm dripping with sweat as I write this..... I opened the Control Box and checked and wiggled every connection....also looked for a short in wires passing through the panel side walls and bottom. Nothing found. Started the Genny....ran normal....Hooray! I checked the no-load voltages....present and normal....Hooray! I then disconnected the shore power and put the Ginny "on-line", waited 30 seconds, and Wallah! Power to the Coach! Ran both AC's one at a time, and then both, with no noticeable groaning from the Genny. Checked the power frequency under no Load and adjusted the Governor for 62 hertz. then put the Genny under full load, Both Ac's, and the frequency was 59.8 hertz.......perfect! Left everything open and accessible and all tools out and I will start it every day for the next several days just to build confidence that it is FIXED! Now it's time for a cool adult beverage......Cheers. Rook
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Old 08-10-2015, 05:32 AM   #11
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Thanks Rook for your post. I too have had a similar experience with my Generac, but have not yet investigated. This info will be very helpful.
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