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  #41  
Old 06-27-2019, 10:39 AM
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Quote:
Originally Posted by andrewwynn View Post
You can use a bit of silicone to hold the cap back on if you break the retaining tab to do a retrofit.

I noticed that only one slip ring gets significant wear so I'm thinking of pulling wife's alternator and reworking the copper bus bars to reverse the armature polarity. Swap the brushes for like $6 and double the lifespan.
I have no idea what the above means... but we need to add the caption "MacGyver" under your forum username.
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  #42  
Old 06-27-2019, 11:54 PM
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The slip ring mod will be a world's first for sure and definitely mcgyver esque.

Spelled out: the spinning part of the alternator has a simple north-south magnetic field that spins around through the stationary windings in the outside part of the alternator.. the voltage is applied through the slip rings and it varies constantly to adapt to the conditions at hand to produce a constant output but it's always the same polarity.

I noticed that only ONE of the slip rings really wears meaning if the polarity was reversed the other one could start wearing instead and you could add a LOT of miles like on the order of 150,000 more miles. I'm hoping to do this to my wife's so I don't have to replace the slip rings. I might not even have to replace the brushes.


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  #43  
Old 06-28-2019, 07:22 AM
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  #44  
Old 06-28-2019, 01:25 PM
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Quote:
Originally Posted by andrewwynn View Post
The slip ring mod will be a world's first for sure and definitely mcgyver esque.

Spelled out: the spinning part of the alternator has a simple north-south magnetic field that spins around through the stationary windings in the outside part of the alternator.. the voltage is applied through the slip rings and it varies constantly to adapt to the conditions at hand to produce a constant output but it's always the same polarity.

I noticed that only ONE of the slip rings really wears meaning if the polarity was reversed the other one could start wearing instead and you could add a LOT of miles like on the order of 150,000 more miles. I'm hoping to do this to my wife's so I don't have to replace the slip rings. I might not even have to replace the brushes.
Me too

I've definitely noticed the polarity difference in slip rings wear, and it makes sense physically too - the landing surface of the electrons will see more wear than the take-off surface.

But I don't see an easy way to swap polarity, either on the brushes / VR end or on the slip rings end.

When I replaced the slip rings on my Valeo 120A, the old ones were basically destroyed in the removal, so just flipping them around is not an option. And if you remove the old slip rings, may as well put in new ones.

Changing the polarity of the wiring within the rotor does seem like a real challenge too.

I definitely won't say it's impossible, and hope you can figure something out here.

Some pics from the rebuild. BTW, everything was pretty easy and trivial ... other than the slip ring wiring. BTW, those slip rings had about 186k miles on them, and actually, they had a lot more life left in them.

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  #45  
Old 06-28-2019, 05:03 PM
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If you can show me a picture of the VR with the cap off I can show you how to swap polarity. I couldn't find any photos I took when I did it.

The power is supplied by buss bars they would need to be cut and Jumpers installed to cross the power.

I think I will attempt this within a few months on wife's car since it's at 170,000 now
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