Coleman PMO 401850 has AC output of 3v. Why? - Coleman Electrical Supplies

SOURCE: coleman 5000 generater-no AC output

Pull off the cover at the end of the generator and locate a 2 lead capacitor, it should read 130UF 200V and replace it, they often go bad and you will not have any output if they are. colman has them for 20.00 shipped. 1-800-445-1805

SOURCE: coleman 5000 generater-no AC output

Try replacing the capacitor. You can buy it from http://www.jackssmallengines.com/do_it_home.html. When you pull off the power end of the generator look at the diodes also. If they look toasted replace them as well