cjb398 38 #1 Posted 22 hours ago I've got a 416-H with the Onan engine. The battery is not charging. I measure about 12.45 at the battery whether it is running or not. I get the same voltage at the regulator output with the engine at full throttle, so it is not charging the battery. I've cleaned and tested the connections and run through the diagnostics as explained in the topic below. It appears that my voltage regulator is not working. I noticed, however, that my AC voltage across the regulator terminals measures about 52 volts AC. Is this normal and will this cause the rectifier to go bad? And why would it be so high? I haven't found any mention of anything like this in the forums. Chuck Share this post Link to post Share on other sites
ri702bill 12,359 #2 Posted 21 hours ago You may have a bad - corroded - ground where the rectifier housing meets the sheet metal. Remove the rectifier, clean the housing and the bolts. Reassemble & check. It is a common issue that shows up over a long time of use. Many of us add a ground cable from the rectifier bolt to a nearby point on the engine or chassis. 3 1 Share this post Link to post Share on other sites
peter lena 9,926 #3 Posted 21 hours ago @ri702bill totally agree on the added ground cable set up , like a clean base on every surface , dielectric grease , on bolt base / threading , pete 1 Share this post Link to post Share on other sites
John c 196 #5 Posted 3 hours ago I just went down a very similar path, even though I'd thought the live terminals were sufficiently clean and connected I ended up with a dremel bit and solder for the live parts and a supplemental conductor straight to battery ground. Share this post Link to post Share on other sites
cjb398 38 #6 Posted 2 hours ago Thanks all for the input. I have checked the ground with a jumper from the rectifier to the negative battery post. No change. I have a new rectifier on order. Chuck Share this post Link to post Share on other sites
cjb398 38 #7 Posted 2 hours ago 17 hours ago, gwest_ca said: How do I determine which of these apply to my engine? I have a 1993 416-H with the Onan 16hp engine. Thanks. Chuck Share this post Link to post Share on other sites
Handy Don 16,848 #8 Posted 1 hour ago 43 minutes ago, cjb398 said: How do I determine which of these apply to my engine? I have a 1993 416-H with the Onan 16hp engine. Thanks. Chuck Here’s a link to the service manual. Lotsa good info! 1 Share this post Link to post Share on other sites
gwest_ca-(File Mod) 12,311 #9 Posted 59 minutes ago You should have the 20 amp system and suspect the D in your spec number follows B and C Your engine numbers should be P216G-I/10976D The 1997 models used spec G Share this post Link to post Share on other sites
