Ed Kennell 41,413 #1 Posted March 9, 2015 While blowing snow on Fri., I noticed the 520 was only showing 12v on the gauge. It did continue to run for 2 hours, but when I stopped to refuel, I had to jump start it . It continued to run till I was done. About another hour. I immediately suspected the $22 RR I installed to fix the charging problem about two years ago. I quickly pulled the leads off the RR and checked the AC ...and breathed a sigh of relief when I saw ~ 27 VAC at 2500 RPM. Put the AC leads back on and checked the B (center) tab on the RR to the + battery post...More relief, I had 14 VDC. My alternator and $22 jungle RR was still alive and well. But the charging voltage was not getting to the voltmeter or the battery. Probably a broken wire. Now I went to the demystification guide, and see there is nothing between the RR B tab and the battery except wire and the 30 A fuse. Maybe I better check the fuse. It wasn't blown....but, see what I found. Replaced the fuse and all is well. Moral of this story....Check the obvious first. 3 Share this post Link to post Share on other sites
MAH 50 #2 Posted March 10, 2015 I have had two times in 15years of automotive service where I had a fuse that appeared ok, was allowing voltage through but very little amps. Always pull the fuses and ohm them out if you have doubt's to its integrity. The other is corroaded wires which will give you the same result. A meter will show you good voltage but if you put a light on the wire you will see the light dim or not light. Having a bulb style test light comes in handy. If you have an led style they will light even with low amperage (most newer lights are led so be careful when purchasing). But the one thing I have learned through the years is always,always, always check fuses first. Too many times I see even seasoned techs get burned on the good old blown fuse (happens to all of us). 1 Share this post Link to post Share on other sites
Ed Kennell 41,413 #3 Posted March 10, 2015 I guess , due to being unlucky, I have turned into a pessimist. And when something quits on these 40-50 year old tractors, I assume some major part failed. I will check fuses first. Share this post Link to post Share on other sites
MAH 50 #4 Posted March 10, 2015 That happens all the time when you get used to working on something. Especially in the automotive business with how complicated vehicles have become, the first thought is a complicated problem which many times it is and the simple is over looked. I started down the wrong path when my 518 quit charging, started to ohm wires, stator and such till I realized I didn't check the fuse. It wasn't charging all winter all because I was thinking the worst. Oh well, sometimes we live and learn only to forget, all we can do is laugh. 1 Share this post Link to post Share on other sites
lynnmor 7,726 #5 Posted March 10, 2015 Looking at that fuse, I'll bet that the contacts in the fuse block are in bad shape. You should pull the block and clean or replace as needed. Share this post Link to post Share on other sites
Theroundhousernr 590 #6 Posted March 11, 2015 You and me where both having similar issues with our 520h's the other year when we got them. I to bought an amazon RR and its working just fine to date. But my 416H had a very similar fuse issue. I believe the fuse box is also pretty ugly inside. I did spray electrical cleaner in mine and plan to tear into it this summer when the blower is on break. number 21. Love those easy fixes! Share this post Link to post Share on other sites
Ed Kennell 41,413 #7 Posted March 11, 2015 You and me where both having similar issues with our 520h's the other year when we got them. I to bought an amazon RR and its working just fine to date. But my 416H had a very similar fuse issue. I believe the fuse box is also pretty ugly inside. I did spray electrical cleaner in mine and plan to tear into it this summer when the blower is on break. number 21. Love those easy fixes! Yep, sometimes we get lucky. That fuse in your post looks like a twin to mine. Me thinks it's time to look for a better fuse block for these guys. Strangely, Mine didn't have a starting problem, just not charging. Share this post Link to post Share on other sites
Theroundhousernr 590 #8 Posted March 11, 2015 I think the 416H has some strange wiring differences from the 520H. The fuses and relays are set up a bit different. Share this post Link to post Share on other sites
cleat 7,177 #9 Posted March 11, 2015 Early and later 520's are different as well. Early 520 (1988, 1989) has the charge wire go from the regulator straight down to the solenoid with an inline fuse just above the starter. I have converted all of mine this way. Later models run the charge current through the 9 pin connector then through the fuse block where it then ties into the harness by the ignition switch. I believe this is why many 9 pin connectors melt on the later models. Cleat 1 Share this post Link to post Share on other sites
