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Old 01-25-2011, 02:16 PM   #1
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Generac LP Won't start after driving in rain

We have a 2000 Dutch Star Diesel Pusher with Generac LP generator mounted up front. Just started having trouble with it not wanting to start when we have driven in rain. We are in South Texas now and have trouble with it not wanting to start with just morning dew on it even though its mounted under or behind front hood. Any suggestions, It's obviosly getting wet, but how do you correct?
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Old 01-25-2011, 02:57 PM   #2
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I assum that when you say it will not start you are saying it spins over when you hit the start button and just will not fire up. If so then if the wetness of the dew is causing the sparkplug wires to short out because they are cracked or the porcelein on the sparkplugs is cracked. The only real place the plug wires can short out is where they go through the metal cowling and come out to the plugs. Normally they go through a rubber grommet that holds them away from the metal cowling but the grommet always gets pushed back so the wire rubs against the cowling. You might take a close look there. Also make sure the plug wire boots are tight on the plugs and are not cracked. Like I said the other thing is that the porcelein on the actual sparkplug can be cracked so when they get damp they short out. There is no distributor cap and it is an electronic ignition. The other remote possibility is the ignition coil is cracked so it shorts out when it gets damp. To change the plug wires and the coil requires that you remove the cowling around the motor. I had to drop the generator down and ppull it out to get to mine which is not an easy job.
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Old 01-27-2011, 02:52 PM   #3
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Quote:
Originally Posted by Mike Canter View Post
I assum that when you say it will not start you are saying it spins over when you hit the start button and just will not fire up. If so then if the wetness of the dew is causing the sparkplug wires to short out because they are cracked or the porcelein on the sparkplugs is cracked. The only real place the plug wires can short out is where they go through the metal cowling and come out to the plugs. Normally they go through a rubber grommet that holds them away from the metal cowling but the grommet always gets pushed back so the wire rubs against the cowling. You might take a close look there. Also make sure the plug wire boots are tight on the plugs and are not cracked. Like I said the other thing is that the porcelein on the actual sparkplug can be cracked so when they get damp they short out. There is no distributor cap and it is an electronic ignition. The other remote possibility is the ignition coil is cracked so it shorts out when it gets damp. To change the plug wires and the coil requires that you remove the cowling around the motor. I had to drop the generator down and ppull it out to get to mine which is not an easy job.
Thank you for your reply. Did I understand you to say that you can actually replace the spark plug wires? Is that ignition coil outside of flywheel? Are there one or two of them? Could there also be an issue with what they call the [cylinder ground wires]?

Thank you so much for your help Allan Brown
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Old 01-27-2011, 04:20 PM   #4
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It would help me to anwer some of the questions better if I had the model number of your Generac. Yes on mine I could replace the wires from the coil to the plug but again you would have to remove the cowling off your motor to do that and that has to be done from the top of the generator. What kind of access do you have to your generator? Is it bolted in on on a slide?
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Old 01-28-2011, 09:24 AM   #5
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Our model No is 9743-3 Series NP-66LPG We have about 4 inches of space above generator and it is open to the front. It's mounted on a tray bolted between the frame. It would come out to the front by removing center section of front cowling below it, or bumper.The top cowling on generator is bolted on. I'm hoping I can get top off without having to remove entire unit. In the parts manual it doesn't show the plug wires as a separate item that can be purchased. I'm concerned that if it were made up from pieces that plug terminal could be pulled off when changing plugs.Thanks for the help Allan Brown
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Old 01-28-2011, 09:41 AM   #6
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That is the same generator that I had in my previous MH. I had to lower my generator down with a floor jack to work on it. Yes the coil is located outside of the flywheel. That is really a Briggs and Stratton Vanguard motor so those parts are readily available. The hardsest thing to taking off the cowling is the area around the carb because of the governor linkage and hoses. I had to take several digital pictures and mark the adjustments with a Sharpie before I took it off. One major problem I had is that there is a very small rubber tube that comes in vertically to a small brass tube on top of the carb. That brass tube broke off when I tried to remove the old stuck on hose. It left part of the threaded tube in the carb. They do not make that carb anymore. I managed to get out the piece stuck in the carb and there was a enough thread left on the tube to thread it back in. Wow, was I worried. So be very, very careful. If you email me at mike.c@mindspring.com I will send you .pdf workshop manual for that generator series.
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