Help w/lincoln wp250 not starting

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My uncle gave me a WP250 with an onan p218 engine, but it needs to be jumpered to start. Any ideas on what the issue may be? If I remember him correctly he said I need to put a jumper over the coil or it will not start. Could it be the starter or the coil, or something else in the ignition system? Thanks for any help!
Reply:Could it be he said a jumper from the battery to the coil? This bypasses the on switch and the oil pressure switch. Down load the owner's manual form Lincoln, you will need the code number to get the correct one. There is about 5 different wp 250s and most of those are diesel.A diagram in the back of the book that will be very close to your welder. To get a code correct diagram you will have to call Lincoln and ask for one.
Reply:Free Onan Manual PDF file,it helped me figure out what was wrong with the charging system on my P216 Onan on my Ranger 8.Just go to the site and then click save and save it to your computer for future reference anytime,i printed mine out and now have a manual on hand at all timeshttp://www.cumminsonan.com/www/pdf/manuals/965-0762.pdfLincoln Ranger 8 225Lincoln 180 ProMigMiller Maxstar 200DXInternational Ironworkers Local 70930+ years and counting
Reply:Thanks for the replies. ccaawg I do have the code and I did download the manuel. The welder does try turn over when I flip the on switch and hit the start button. It just won't fire up. I'm stopping by my uncle's today so I'll get a definate answeron the jumper. And Fabcrazy thanks for the link I tried last night and was having trouble getting pdf's for an engine. I'm hoping this one's close enough.