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Old 03-01-2014, 08:29 PM
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Default New alternator question

Ok, so I just got my mechman 320 amp alt in yesterday. I pulled it out the box, checked it out. Seems like it's built like a tank. There's just something about it bugging me though.

I'm not sure if this is normal, seeing as how I understand what an alternator is and [I think] generally how it functions, I've never actually handled one outside of a vehicle though.

I inspected it to make sure that nothing was cracked/obviously loose from shipping. They do a great job with their packing. So I was checking it out, looking at the fan[ish] on the inside just behind the pulley. I turned it a few times, and after making a complete loop it kinda catches. Not enough to lock it up, but you can tell it isn't a smooth transfer. Can also hear what sounds like something being scuffed.

Now, in my mind, an Alt is basically a fan and a bunch of wound copper that essentially produces kinetic energy from friction? If I am wrong, please, correct me. 9/10 of my intentions of joining this forum is to learn.

The real question it boils down to, is this slight catch and scuff normal and intended? or is there something off in the balance? I'm about to install it tomorrow, I just want to make sure I don't need to RMA it.
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Old 03-01-2014, 08:38 PM
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Should be smooth as far as I've ever dealt with. The catch or scuff you refer to doesn't sound productive.
I just installed a reman'ed 160amp in my mirage and both the old and new spun freely, no obstructions.
The old one wasn't shot totally yet, but it sure charged low in this cold weather.
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Old 03-01-2014, 08:42 PM
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Thanks for the feedback. I had a thought that it wasn't right. Just picked it up and and turned it on it's back and front to see if it would change anything [IE something's loose so therefore out of balance] and didn't change a thing. Sucks I waited 3 weeks on this thing and it gets here and it's out of balance. Now I gotta talk with Mechman, Pay return shipping, wait another 3 weeks and hope everything is right.
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Old 03-01-2014, 08:49 PM
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I'm sure Mechman will take care of you and it will be worth the wait.
Good Luck. Update and let us know the outcome, please.
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Old 03-01-2014, 08:53 PM
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I will. Just bummed out cause it seems like everything about my build has been horribly timed or jacked up. Fedex AND UPS losing my orders and having to reship. Wire I order is wrong kind, get comped the difference for the mess up. Order the ring terminals I forgot to get in the first flippin' place. says shipped, a week later it is actually JUST then being shipped. "2 day priority"=2 days from destination to destination apparently, and has just now reached my state. 12* days later. and now this. it's been over a month. and I JUST got most of my orders* middle this week. now this... but I'm ranting at this point. #vent

Anyway, I'll let you guys know what happens.

edited for clarity

Last edited by southernbass; 03-01-2014 at 09:00 PM.
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Old 03-02-2014, 11:51 AM
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Man sorry your having so many issues, but you will be happy once you put it all together. You did good by spinning it to make sure it spun freely before install or you may have had issues while driving and that sucks.
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Old 03-02-2014, 04:34 PM
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Oh yeah, I know that's right. I talked with Matthew at Mechman he said it happens sometimes and it was most probably due to shipping. [not necessarily throwing packages around but general bump and haul type ordeals.] Said it was normal, and even if I installed it and something messed up they'd cover it under warranty. [I stressed the importance of my documenting this issue in case they tried to throw a "user error" at me.] After I played with it a little more free spinning it with my hands, the catch and sound dulled significantly indicating to me that Matthew was right, and that there shouldn't be any issues. So after some very slight modification to my bracket [along with rigging up a ground for my voltage regulator] I installed it and it's working like a champ so far. Mug's built like a tank when I took my old alternator out. Still haven't ran my big 3 or actual wiring, but with the 4 awg wire I've been running and an 80 amp fuse I don't see any issues with my wires kersploding or anything. Won't produce more than is being pulled, at any rate. I tested at idle running full tilt [after I dropped my coils into parallel, mind you. went from 2 ohm nominal to .5 nominal] and didn't see a drop more than .2 volts on my batt using a DMM. So, for the amp to be running under half power [since it calls for a 200 amp fuse, not an 80], I thought it'd still be a good test of my alternator [considering I was dropping into the 12 range when I was running 2 ohm nominal with my stock alt]. All in all, mission accomplished. Little afroengineering and elbow grease and we're good to go. Couldn't be happier.

Thanks for the input though guys. It's much appreciated.
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Old 03-02-2014, 04:39 PM
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When you spin it in your hand freely, it should make no noise at all (If it's sqeaking, it's starting to go bad or is bad, depending upon the condition) and should spin freely as well.
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Old 03-02-2014, 05:00 PM
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Quote:
Originally Posted by Boomintahoe View Post
When you spin it in your hand freely, it should make no noise at all (If it's sqeaking, it's starting to go bad or is bad, depending upon the condition) and should spin freely as well.
squeeking can be caused by the brushes on the new sleeve that's still sheened over/chormed and is perfectly normal. metal hitting would be a no no if it didn't go away after being advised that it should
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Old 03-02-2014, 05:13 PM
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Quote:
Originally Posted by Jeffhulbert50 View Post
squeeking can be caused by the brushes on the new sleeve that's still sheened over/chormed and is perfectly normal. metal hitting would be a no no if it didn't go away after being advised that it should
thats what my thinking was.,i drove on it about an hour thus far and have had no issues so far. Not to say i wont, i hope, but so far so good. Working like its supposed to so no complaints. Dropped right in, for the most part, as well. Ill be happier when my terminals come in though. Cant wait to run my wires and see what this thing can really do. Officially running a little under half powered. Still breaking the sub in too (sq are stiff as fawk. At least mine is.) Glad i can get some more power on it tho. Help lossen stuff up more. Again, thanks everyone for feedback. It is much appreciated.
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