1650 Keeps Frying Coils

[R Bedell]

It went from 12.7 up to 14.4v at 3/4 throttle.

One more test. Run a jumper wire from the Battery Negative ( - ) Terminal to the Voltage Regulator Case. In other words, you are positively establishing a "ground path". Start the engine up and at WOT, what is the voltage at the Battery Terminals..???

[vr4Legacy]

Originally Posted by J-Mech

I basically agree with Don. 14.4 is ok. On this system, it's just a bit higher than "normal" but I've seen the run up that high on some machines.

Jason, do one more test for me.
Disconnect the stator wires from the R/R. (little black box, 3 wire connector) OHM either of the outer wires to the engine block. See if there is anything. Should be no OHMS. If it reads anything, you have a bad or shorted stator, and it may be leaking A/C voltage. If you don't get anything, I'm going to say you got some bad coils. I'd look at another brand. HOPEFULLY, that is all it is. Doesn't sound like there is anything else wrong with the system.

I'll check that tonight. Crossing fingers it was just a little bad luck. The coil on there now is a different brand, so maybe it will fair better. I believe it's the one that came on it.

Originally Posted by R Bedell

One more test. Run a jumper wire from the Battery Negative ( - ) Terminal to the Voltage Regulator Case. In other words, you are positively establishing a "ground path". Start the engine up and at WOT, what is the voltage at the Battery Terminals..???

If the AC leak test turns out ok, I'll try this out.

Out of curiosity, what voltage would be considered too high? So I at least know not to keep running if it hits. I didn't test at WOT, but at 3/4 with no load, I'd think the numbers should be similar.

If both things check out, I'll just drive it around and see how it goes. Hoping to get the tiller hooked up and maybe use it Saturday.

[R Bedell]

Out of curiosity, what voltage would be considered too high?

As previously stated....13.7 VDC is normal

[J-Mech]

14.8v is about the top. If it hits 15v, that's too much. It won't like fry anything right away.... but extended time will kill the battery and eventually everything else. (Coil, PTO clutch, ect.)

[vr4Legacy]

Checked the stator and got no reading when grounding either wire.

I then fired it up and revved it full throttle. Saw it hit 15.7 volts and shut it down.

I assume this means I need a new regulator / rectifier?

What's everyone think about this one? Doesn't say K motors, but the P/N matches what's on the one I have now.

https://www.amazon.com/gp/product/B0...HGBAEUYH&psc=1



On a good note, I fueled up the 1200 and she fired right up after a long hibernation. I'll be mowing tomorrow if the weather holds out

[vr4Legacy]

I ordered the above regulator for my 1650. When i got it, the terminals extend differently on the back of it. They stick straight out the bend out at a 90, so if I bolt it up, it's going to short them all out. I've looked a few online and most appear the same. Am I missing something? Or did I just order the wrong regulator.

Just about every image I find of one looks the same.

I've attached images of the old and new side by side. The old one has p/n 41-403-01, with appears to cross reference to 25-755-03. The one I ordered should replace that.

What am I missing??

[vr4Legacy]

After some thinking, and looking. Maybe the PO had the old regulator in backwards..

The first pic is how the old one was bolted on, with the heat sink facing out. If I bolt the new one on with the heat sink facing into the flywheel, it will work just fine. Is this how it should be mounted? Makes sense as the flywheel would blow air at it too.

[budscub]

Hello Vr4legacy, I may be wrong but I believe the regulator mounts with the narrower portion into the blower housing. If this is correct then the added offset in the terminals should actually increase the clearance to the terminals.

Guess you were typing the same time I was.


Glad to see you figured that out. You will want to check the connection terminals on the wires too. These terminals will get hot and loose the temper that keeps them tight. I have use pliers to tighten them ( close them up a little), but it will only be short lived. I usually end up having to replace the terminals.

[R Bedell]

The new V/R is "correct" (25-755-03). There should be a 3 terminal Molex Plug in the harness that slides onto the terminals. IF NOT............the Stator wires go to the two "outside" terminals and the B+ wire (gray) goes to the middle terminal. TAKE NOTE...... This V/R must to be grounded to function correctly. The "finned" portion of the V/R must be mounted against the air of the Flywheel, to keep cool.

[vr4Legacy]

Thanks gentlemen. Had me baffled for a min...