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Alternator taking a crap, time to replace!

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Old Jul 31, 2013 | 10:14 PM
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Alternator taking a crap, time to replace!

So, the alternator in my truck is taking a **** slowly and I need to replace it. I know that the DC Power alternators are popular but they are quite expensive not to mention they're on backorder. My other thought is if it craps the truck is down. I see that I can get a 140 amp alternator from the local parts store for 150 dollars with a lifetime warranty. I'm thinking of going this route just because it's easily replaced if it goes bad and it's 30 more amps than stock. Thoughts?
 
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Old Jul 31, 2013 | 10:47 PM
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Cody I hope its not the Kragen alt, there life time is just Months for us. Napa or Car quest seems to do pretty well.
 
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Old Jul 31, 2013 | 10:55 PM
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I had the same exact thought and went with a Lifetime replacement from Advance Auto yesterday. I purchased a new alternator for $159.99. It was originally $179.99 but they sent me a coupon for $20 for spending more than $100 in the store. Worked out perfect. I have a 110 Amp on my truck, but I upgraded to the 140 Amp and put my old one back in the box for their $12 core charge.

Took me a whole 10 minutes to swap it out and I'm back in business. Luckily I caught mine in time. I was only getting 12 volts at full charge.

The other reason I went with the $160 instead of $299 was DC Power is on backorder and approx ship date was 2 to 3 weeks. I needed it ASAP and I liked the Lifetime vs the 2 year warranty. I mean, what do you do if the DC Power Alternator fails? How many days are you down while waiting on another? Those were my thoughts.
 
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Old Jul 31, 2013 | 10:56 PM
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I would recommend the large case 130 amp 3G over the 140 amp 6G myself.

Just takes a conversion pigtail to run it and put out 170+ amps peak.

Josh
 
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Old Jul 31, 2013 | 11:59 PM
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Josh do you have a part number for that puppy?

Sean
 
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Old Aug 1, 2013 | 06:23 AM
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Originally Posted by Yahiko
Josh do you have a part number for that puppy?

Sean
7765 or 94-97 7.3 diesel alternator

Josh
 
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Old Aug 1, 2013 | 07:09 AM
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That's my thoughts as well. The local parts store stocks those things and they have a lifetime warranty and they're half the cost of the DC Power one. My concern is if the DC Power one goes bad then I'm down and will be down until I could get another one and they seem to be consistently on backorder. The 2 year warranty on the DC Power alternator kind of sucks as well, especially if you're spending that kind of money on one. I've had great luck with the Ultima alternators from O'Reilly's, but really they're the same alternator from all the big brand stores, just repackaged.

Josh, besides the pigtail is there any other things required to run that alternator? Any specific reason to run that one over the 140 amp 6G? They're both a large case alternator (better cooling?). I'm not understanding how the 130 amp 3G can put out more amperage than the 140 amp 6G.
 
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Old Aug 1, 2013 | 07:41 AM
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The large case 3G was underrated and the 6G is overrated a touch.

The 130 amp 3G is really more a 165-175 amp alternator.

Josh
 
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Old Aug 1, 2013 | 08:19 AM
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So besides the pigtail do you need anything else to run it? All I need is to look for one for a 94-97 7.3 diesel? I'll do some price checking and see what I can find.
 
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Old Aug 1, 2013 | 09:54 AM
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Originally Posted by the_auto_tech
So besides the pigtail do you need anything else to run it? All I need is to look for one for a 94-97 7.3 diesel? I'll do some price checking and see what I can find.
Just the conversion pigtail. I got mine (about $12) from a local alternator/ starter rebuilder, but eBay has plenty.

Josh
 
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Old Aug 1, 2013 | 09:58 AM
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Perfect. I wonder if I could just make my own pigtail for it. You have a picture by chance so I can see what I'm working with?

EDIT: You sure that isn't a 7768 number?

EDIT 2: Apparently the hot ticket is the 3G large case 130 amp alternator. Apparently better cooling and better output than our 6G large case 140 amp.
 
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Old Aug 1, 2013 | 11:14 AM
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I think 7768 has the slightly larger pulley than the 7765.

Both pulleys are smaller than the stock 110 6G pulley.

Josh
 
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Old Aug 1, 2013 | 01:01 PM
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It does look like Lester 7768. You want the smaller 7.3 diesel pulley and not the larger 4.0 Explorer pulley if its possible.

Josh
 
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Old Aug 1, 2013 | 01:16 PM
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Do you have any decent auto electric shops that can rebuild your alternator and boost the output?
 
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Old Aug 1, 2013 | 02:03 PM
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Same boat.

I'm in the same boat, my alt is going out. I was thinking about local rebuild shop, but wasn't sure due to these alts have a bad rep. Will rebuilding it fix the problems, or is it better to buy a new one?
 
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