Stanley 5 #1 Posted April 1, 2018 The battery on my 93 520H is not charging. When checking the ac voltage to the regulator I was getting approx. 27v at idle and 52v at full throttle using a cheap meter. These voltages are in between the 20 ampere system and the 35 ampere system. I searched for part 191-1847 (35 amp)and found 1 listed for over $400.00 and many listed for 191-2208 (20 amp) for$10 to $15 Any ideas on why there is such a large difference. I am going to try the $10 to $15 20 ampere regulator Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,488 #2 Posted April 1, 2018 The Onan's are all advertised as being 20 amp in the Wheel Horse/Toro info. Garry Share this post Link to post Share on other sites
cleat 4,936 #3 Posted April 1, 2018 Yep, just get the cheap one. Make sure your regulator is properly grounded. Are you getting 14V DC at the center terminal with the engine running at full throttle? If so then there is a wiring issue somewhere else. Do you get 12V at the center terminal with the engine off ? If not then there is a wiring issue somewhere else. 2 Share this post Link to post Share on other sites
Ed Kennell 35,626 #4 Posted April 1, 2018 The $20 regulators work fine. 1 Share this post Link to post Share on other sites
Stanley 5 #6 Posted April 1, 2018 Thanks everyone. I am ordering new one off of Amazon. I had no voltage from the center tab to ground while running at full throttle. 1 Share this post Link to post Share on other sites
lynnmor 6,762 #7 Posted April 1, 2018 The regulators are as low as $9.95 on a popular auction site. Most of the cheap ones there are from the same manufacturer. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,488 #8 Posted April 1, 2018 7 hours ago, Stanley said: I had no voltage from the center tab to ground while running at full throttle. You should at least have battery voltage. If you don't the wire from the regulator center terminal to the battery + is compromised somewhere. Two reasons for it. These regulators need to see battery voltage to turn them on so to speak. Then they can regulate the charge current to charge the battery. The regulator uses that wire to get the charge current to the battery. Garry 2 Share this post Link to post Share on other sites
ericj 1,576 #9 Posted April 2, 2018 3 hours ago, gwest_ca said: You should at least have battery voltage. If you don't the wire from the regulator center terminal to the battery + is compromised somewhere. Two reasons for it. These regulators need to see battery voltage to turn them on so to speak. Then they can regulate the charge current to charge the battery. The regulator uses that wire to get the charge current to the battery. Garry check 9 pin connector and the fuses, When I read your earlier statement about no 12 volts to center pin, that was my first thought, you need 12 volts there to work. You can short out regulator if it does't have voltage there. hence the warning sticker on the inside of the battery tray compartment. One time I loaded one of my 520-H's on the trailer to take to the big show ran fine. once at the show when I tried to start it, it was doa. found a blown fuse, when I replaced it it blew right away. finally traced problem of short to the RR. the reason it shorted was becuase of problems getting voltage to the RR center pin. good luck PS it don't hurt to have an extra new RR on hand eric j 1 1 Share this post Link to post Share on other sites
Stanley 5 #10 Posted April 2, 2018 I just ran out to garage and rechecked it. I do have 11.9 volts from center tab to ground while running. I ordered 2 Caltric Rectifer Regulators this afternoon, should be later this week hopefully. Thanks everyone 1 Share this post Link to post Share on other sites
Stanley 5 #11 Posted April 4, 2018 I ordered 2 RR from Caltric on Sunday afternoon, received them in the mail at noon on Wednesday. I replaced the faulty RR and now have 13.9 volts on volt meter. Now if it would quit snowing, I could go roll the lawn. Thanks again everyone 3 Share this post Link to post Share on other sites
leachy 0 #12 Posted April 11, 2018 Gents Can do you have the wiring for the regulator as I have one wire going into the main block before the fuse box and it terminates there and isn't connected to anything. Share this post Link to post Share on other sites
Stanley 5 #13 Posted April 11, 2018 If you go to wheelhorse home page, scroll down to Wheel Horse Reference, click on Wheel Horse Manuals, then download 1985 to 2001 Riding Products Demystification Guide. It is a great resource for troubleshooting electrical problems. Info on the 520H starts on page 7-97 Share this post Link to post Share on other sites
WVHillbilly520H 10,369 #14 Posted April 11, 2018 1 hour ago, leachy said: Gents Can do you have the wiring for the regulator as I have one wire going into the main block before the fuse box and it terminates there and isn't connected to anything. Try this all the manuals and demystification guide are here on free to download, but here's a quick pic of the wiring diagram from my owners manual, Jeff. Share this post Link to post Share on other sites
Ed Kennell 35,626 #15 Posted April 11, 2018 That is probably the trigger wire for the tach. It uses one of the AC terminals on the RR. Share this post Link to post Share on other sites
