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  #1  
Old 2 Weeks Ago
Helldriver Helldriver is offline
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Default Alternator conversion on a 1975 xlh

I recently had to replace a bad generator on my 75 xlh. I decided to go with V twin mfg’s alternator conversion kit that came with a solid state regulator/ rectifier combo. I’ve run into a couple of snags and I’m hoping someone(s) on here can shed a little light for me.
The generator had a washer installed on that served as a deflector of oil keeping it from traveling down the breather tube. When installing the alternator, the (albeit vague) instructions say not to install it. So I did what they instructed and, as I assumed, an abundance of oil is coming from the tube. Especially when the rpm’s are increased.
I’m in debate as to whether I should Install the washer and if that will damage the system. It seems to sit in the exact position as it did on the generator, but I’m not sure.
Also, I checked my charging voltage and it seemed a little low, 12.75 v
Took the reading off the alt with the bike running and I’m getting good ac coming out that increases with higher rpm’s
When I tried testing the regulator, using an ohmmeter, the reading came back as an open loop, showing no resistance.
I had connected the positive lead from the meter to the battery wire from the reg and the negative to one of the leads.
There are three leads coming from the regulator. One is longer and intended for the battery and the other two go to the alt. They aren’t specified as the instructions say it doesn’t matter how they connect to the alternator, just as long as both leads connect to the two
Alternator leads.
I used tried switching polarity and using the different leads as well and still came up with an open loop.

Am I testing this circuit incorrectly? And how likely is it that I got
a bad regulator out of the box?

Sorry this is long winded, just trying to be as clear as possible.
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Old 2 Weeks Ago
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Default

The instructions might be referring to the "generator oil deflector" which goes between the generator and drive gear. Harley got rid of that part on the 82+ generators, so I imagine V-twin did the same thing.

The instructions I found tell you how to check the alternator and regulator under the Troubleshooting section.
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With the regulator on the bike and connected to battery, but not the alt - you should have zero resistance and no reading. Put a DC volt meter across both leads (to alt)

with it off the bike- use an ohm meter- one lead to the positive wire (the middle long one) and the other to one of the wires going to alt wire...should be about 4 ohms. other lead should be same.

Why do you think you have problems? 12.75 at idle is about right, and it will go up with rpms (since the alt is disconnected from the reg for this test) It should increase up to 26 volts at high rpms. AC volt meter for this test at the batterry with everything hooked up.

As far as that washer or oil slinger- don't know why they say to leave it off- but since it comes with a ! in the instructions, I left it off both my applications. I think your oil issue is unrelated, perhaps just wet sumped.
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Old 2 Weeks Ago
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When the EPA wanted to clean things up the redesigned the vent system routing it to the back of the air cleaner thru the banjo head bolts. There should be no issue to install the slinger washer on a alt conversion
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kitabel kitabel is offline
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it seemed a little low, 12.75 v
If it's working correctly, that means that you are discharging your battery at idle (ignition, dash, lights) - just like the generator. The transfer to the battery is proportionate to the voltage difference.
Regulated alternator output should be between 13.8 and 14.2 volts.
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I did perform diagnostics on the alternator while it was running and it checked out.
The regulator wouldn’t give me an ohm reading so I’m assuming it’s bad.

And I agree, the charge at the battery should be at least 13v and increase at least a little when the rpm’s go up.

The oil deflector is a different mechanism from the washer I had mentioned.
My concern with the wash is mostly clearance based but I’m going to do my best to determine what will work and install it.

V twin Mfg’s customer service is pretty much unreachable to me for some reason so I’m going rogue.
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you keep saying regulator , do you mean rectifier/regulator?
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V twin Mfg’s customer service?

It's a loop of Tedd laughing his head off.
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Yes, it’s a regulator/rectifier.
Solid state. Comes as a matched kit.
Pretty sure all of them are combos. Haven’t seen a separate rectifier on any schematics.
I’m assuming the generator created direct current that didn’t need to be converted from alternating current.
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Helldriver Helldriver is offline
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At this point, I’m assuming the regulator/rectifier is shot.
But the alternator is functioning and the installed washer is preventing the oil from seeping.
Is there a preferred regulator/rectifier anyone would suggest?
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