stephan07 10 #1 Posted March 22, 2012 the charging system hasnt been used as long as i have had the tractor. it was used only for pulling. now i am recommisioning it as a garden tractor. i was going through my 85 310-8 and hooking up the charing system and i have noticed that when i hook up my b+ wire my rectifier buzzes. as i understand it the two wires from the stator plug into the outer two terminals on the rectifier. using my power probe i was checking for oddities and i found one of the stator wires showing ground. if i leave the grounded wire off the rectifier and hook everything else up no buzzing. i am open to ideas here i am good with electrical just used to doing it on cars. Share this post Link to post Share on other sites
Save Old Iron 1,571 #2 Posted March 22, 2012 One of the many secrets uncovered in SOI's workshop was the fact that the B+ terminal is electrically common with one of AC terminals. In a rare appearance outside the design studio, the master himself hits the test bench and does a final quality control check on a regulator repaired for his neighbor's C120. This reg had the B+ terminal corroded completely off the circuit board. On closer investigation, the B+ and the AC terminal pointed out here are both crimped and soldered together inside the regulator assy. The regulator was able to be re-used by soldering two wires to the remaining AC terminal and running the wires to the B+ ignition switch terminal and to the stator. Buzzing ??? Whatever this turns out to be, it will be an interesting post. Reconnect the stator and B+ wires back onto the regulator and check both DC and AC on the battery terminals with the engine at at least 3/4 throttle. DC should be 14.5 "ish" and very little if any AC ripple. Any significant ripple may indicate the internal resistance of the battery is high ( probably from sulfation) and may need to be replaced. I suppose it is possible loose components inside the regulator body could be vibrating ??? But that 's the key, something has to be moving to create a buzzing sound. Share this post Link to post Share on other sites
stephan07 10 #3 Posted March 22, 2012 ok i will try that. i dont even have it running while i am getting this noise. i thought it might be significant that it buzzes only when the stator wire that shows a ground is pluged in, but not while it isnt. i have yet to sart the thing since i hooked it up. also it has a brand new battery. also my stator looks nothing like the one pictured. is it posible i am hooking it up to an incorrect box? there is no heat sink on it what so ever Share this post Link to post Share on other sites
Save Old Iron 1,571 #4 Posted March 22, 2012 Even on the "Onan" style regulators, one AC and the B+ terminal are electrically common. The association with buzzing when connected versus no buzzing when disconnected only means you have completed a circuit with the stator wire plugged into the "regulator". I reread your post. When I first saw the word "pulling", I thought pulling as in no mower on the tractor - just used for pulling a cart. If the tractor was used in pulling contests, or highly modified, anything is possible. Is it possible the tractor has had a capacitive discharge ignition box added (MSD ) - sometimes they "sing" a little. Share this post Link to post Share on other sites
TT-(Moderator) 1,162 #5 Posted March 23, 2012 An '85 310 should have the dual-circuit alternator without a rectifier/regulator. The stator should look like this: It sounds like you might be confusing the relay for the safety interlock switches for a R/R. Can you get pictures? Share this post Link to post Share on other sites
stephan07 10 #6 Posted March 23, 2012 ill work on getting pictures Share this post Link to post Share on other sites
Save Old Iron 1,571 #7 Posted March 23, 2012 It sounds like you might be confusing the relay for the safety interlock switches for a R/R. Well there you go then. This style stator has both windings grounded to the engine block / chassis. If you are applying the 12 v AC lighting tap of the stator to any type of relay coil, the AC voltage will cause the DC relay coil to buzz. The electrical checker you are using would indicate the lighting tap of the stator to be connected to ground - the stator winding is only a few ohms worth of magnetic wire. The charge tap should have a diode wired into the lead under the heat shrink tubing. The diode on the charging section may prevent your tester from seeing ground on that winding. Good call TT. Share this post Link to post Share on other sites
JC 1965 1,532 #8 Posted March 23, 2012 An '85 310 should have the dual-circuit alternator without a rectifier/regulator. The stator should look like this: It sounds like you might be confusing the relay for the safety interlock switches for a R/R. Can you get pictures? Ok guys, I have a question. I would like to swap out an old K301 that has battery ignition with a mag 14 that came off a 1987 414-8. The mag has the same stator shown above in TTs reply ( dual circuit alternator without a regulator/rectifier). The tractor that i would like to install the mag on (1979 C-121 ) has the 103990 ignition switch. How do i wire the mag when i put it in the C-121 ? Will i be able to use the regulator in the C121 ? I guess what is most confusing is that the dual circuit stator doesn't use a regulator. I've looked at the wiring diagrams for both tractors and i just don't know what to do, because of the differences. S.O.I. or someone i need your help. :hide: Share this post Link to post Share on other sites
gwest_ca-(File Mod) 11,390 #9 Posted March 23, 2012 The wiring diagram for the 1987 414-8 in the 523 page Demystification Guide is wrong showing a 15 amp startor - 4 pages p7-87 to p7-90 Use the diagram in the operator manual #810473R1 Garry Share this post Link to post Share on other sites
stephan07 10 #10 Posted March 23, 2012 ok after doing a little research the engine in my tractor is out of c145 its a k321. will this need a rectifer? i dont know what year the c145 is. i am only guessing at the year of my 310 my id tag is worn and i cant read it. Share this post Link to post Share on other sites
