timnjulie Report post Posted April 7, 2022 (edited) I have a 2005 Thor Damon Astoria 3769 class A motorhome with a Generac 7,500 diesel generator. Several days before I left on trip I used generator and everything was working fine. 2 days later when leaving for a trip noticed no power to coach, generator was running fine. I had shore power to coach no problem. There were no breakers tripped or fuses blown. Any ideas? Someone thought could be voltage regulator. I had it looked at by a technician recommended by campground and that’s what he thought. He checked all connections, contacts, switches, etc. Forgot to note, I was plugged into garage outlet with powercord and power was lost for 5 hours, don’t know if there’s a correlation, I had a surge protector and nothing tripped. Edited April 7, 2022 by timnjulie Left out details Share this post Link to post Share on other sites
whiteeagle Report post Posted April 7, 2022 You probably covered this but did you also mean the breaker on the generator itself was also not tripped... Share this post Link to post Share on other sites
timnjulie Report post Posted April 7, 2022 Correct, the breaker on generator did not trip. It’s running fine, and starts right up. But when I am on generator power only there’s no power to the coach. Share this post Link to post Share on other sites
whiteeagle Report post Posted April 8, 2022 Sorry I can't help.... sounds like transfer switch not working or bad connection - but beyond my level. Share this post Link to post Share on other sites
timnjulie Report post Posted April 8, 2022 The technician checked the transfer switch and it shows low voltage to the switch. Thanks for your reply. Tim Share this post Link to post Share on other sites
frank.bergamo Report post Posted April 8, 2022 Try turning the breaker on the generator off and on a few times. Sometimes it is hard to see the breaker tripped. It also will start and run with breaker tripped. Hope this helps. Share this post Link to post Share on other sites
rayin Report post Posted April 8, 2022 I suspect a faulty transfer switch or burned contacts if all breakers are working properly. Have you tested for 120VAC at the power cord from the genset (inside the transfer switch box)? Do not switch power sources when large appliances are running, it can cause arcing between the contacts, which then eventually causes failure. DISCLAIMER If you are unsure of your ability to perform such a test, call a professional! Share this post Link to post Share on other sites
timnjulie Report post Posted May 9, 2022 It turned out to be a bad generator voltage regulator. Share this post Link to post Share on other sites
timnjulie Report post Posted July 7, 2022 I replaced the generator voltage regulator and it’s acting up again. I can run 1 A/C unit at a time, microwave comes on but won’t warm food. Only getting 80 volts to coach. Repair shop thinks it’s a bad regulator that I put in, I bought it new from Generac. Any idea’s? I appreciate any suggestions. Thanks. Tim Share this post Link to post Share on other sites
hermanmullins Report post Posted July 7, 2022 Tim, take it back to Generac, if that doesn't solve your problem take it to Generac authorized service center. Herman Share this post Link to post Share on other sites
timnjulie Report post Posted July 8, 2022 Thank you I will give it a try. Share this post Link to post Share on other sites
timnjulie Report post Posted April 16, 2023 It turns out that all I needed was to reset the voltage regulator after I replaced it, it works fine now. Thanks for your advice. Tim Share this post Link to post Share on other sites
