Pnptractr 35 #1 Posted January 2, 2020 Does anyone know of a procedure to bench test a full bridge rectifier used with an HHM80 Tecumseh? I ran the manual tests on the machine and obtained less than a volt on the B+ wire that’s supposed to do the charging....so I remove the rectifier to find a part number and noticed the three terminals were pretty rusty.....found a possible replacement but it’s for 15 amp system...and the manual says this is 10 amp...not sure if compatible. The B+ wire acts like a diode...and shows about an ohm of resistance...overload when test leads swapped. The AC terminals flow both ways with about 1.5 ohms....Testing with Fluke Digital MMeter. Any advise is welcome. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,496 #2 Posted January 2, 2020 Here is a parts list for the engine. https://www.partstree.com/models/hh80-110112d-tecumseh-engine/engine-parts-list-2-1/ The regulator was supplied with the engine so is not in the tractor parts lists. The 10 amp regulator is Tecumseh part number 610749. Wheel Horse may have used a 101405 part number but have not been able to prove it. That number may be a typo. The 15 amp regulator is Wheel Horse 101450. You can use the 15 amp in place of the 10 amp but the terminal locations are different. The 15 amp is usually much cheaper because of supply and demand so it is a good choice. You can not use a 10 amp regulator on a 15 amp system for obvious reasons. This is a service bulletin they published when the solid state regulators first came out There is no way to test a solid state regulator. The test procedure verifies all the other aspects of the system meet specification and if it still does not charge the regulator is at fault. Keep in mind you must have a fully charged battery in good condition connected for the test procedure to work. With the key ON and the engine NOT running you must have battery voltage at the DC+ terminal on the regulator and the body of the regulator must be grounded. The regulator needs to see battery voltage to turn it on so to speak before it can regulate the charge current. Garry 1 Share this post Link to post Share on other sites
Pnptractr 35 #3 Posted January 2, 2020 Fine business.....thank you. Will clean existing terminals and check wires are all conducting...then do prescribed test. Let you know how it works ok...You guys make this forum rock! 1 Share this post Link to post Share on other sites
Pnptractr 35 #4 Posted January 3, 2020 So...removed rectifier from tractor framing and cleaned terminals and wire term ends...verified 30 VAC from engine dynamo on the two green outer wires. Re-installed rectifier, RE-attached wire harness and fired engine. 12.7 VDC on battery terms. Same as static No charge indicated... Any sources for replacement ? Share this post Link to post Share on other sites
Pnptractr 35 #5 Posted January 3, 2020 Got it. Should be here in a few days....wow...hope it works. Share this post Link to post Share on other sites
