Alternator taking a crap, time to replace!
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Seeing 14.5 volts immediately after start with a 270+ amp alternator may shorten the life a little, but not excessively.
Josh
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Joined: Oct 2012
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Did the mod as per Ed, didn't make any difference on how much it charges.
Laughing Gas
Joined: May 2009
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From: Mesa,AZ
So my alternator is starting to go. I do not now the difference between 3G and 6G. But if I understand correctly a 140 amp alternator for a 94-97 7.3 will plug and play without any pigtail connections. Is this correct?
Posting Guru
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That's all I did. Works perfect for my needs.
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For a little extra kick also buy this:
Overdrive 8 Groove Pulley Gain Output Idle IN Some Apps Ford Alternator 6G 3G | eBay
For the 3G, it's 94-97 7.3 Powerstroke
You'll need this pigtail adaptor:
Ford Alternator 6G TO 3G Conversion Harness | eBay
Josh
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
I went with the G6 140 AMP upper one for my replacement I recall it was just
under $200 with a Whopping $5 core. Yes I said $5.00 core from O'Reilly.
The down side is it is Chinese
but it's doing a much better job.Anyone know what the set point of the voltage regulator is for our application?
I found that you can get a few different set points with a new regulator. You
just have to order the one you need.
BTW It took more time to get the tools out of the roll a way then to do the change.
Sean
Laughing Gas
Joined: May 2009
Posts: 753
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From: Mesa,AZ
Thanks everyone for the quick replies. I am running out of time to get this truck back on the road for an annual family camping trip. First diesel in the coolant now alternator. Did not have time to shop around but picked up an alternator from Napa it is the top in a two alternator set up unfortunately it is a reman. But we are leaving tomorrow in the am if it all comes Together which at this point looks like it will. Again thank you to all that post on here.
Lead Driver
Joined: Oct 2010
Posts: 5,420
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From: Ouray, CO
If you want the 140 amp 6G, ask for the UPPER alternator, for a dual alternator set-up... 2003-2007 6.0.
For a little extra kick also buy this:
Overdrive 8 Groove Pulley Gain Output Idle IN Some Apps Ford Alternator 6G 3G | eBay
For the 3G, it's 94-97 7.3 Powerstroke
You'll need this pigtail adaptor:
Ford Alternator 6G TO 3G Conversion Harness | eBay
Josh
For a little extra kick also buy this:
Overdrive 8 Groove Pulley Gain Output Idle IN Some Apps Ford Alternator 6G 3G | eBay
For the 3G, it's 94-97 7.3 Powerstroke
You'll need this pigtail adaptor:
Ford Alternator 6G TO 3G Conversion Harness | eBay
Josh
summitracing.com claims to have the conversion harness in stock for around $40 IIRC. And O'reilly's has the alternator (NEW, not reman) in stock also for about $160 (w/$10 core IIRC). This is my plan shortly...
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Josh
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Josh
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From: Spanaway
If you want the 140 amp 6G, ask for the UPPER alternator, for a dual alternator set-up... 2003-2007 6.0.
For a little extra kick also buy this:
Overdrive 8 Groove Pulley Gain Output Idle IN Some Apps Ford Alternator 6G 3G | eBay
For the 3G, it's 94-97 7.3 Powerstroke
You'll need this pigtail adaptor:
Ford Alternator 6G TO 3G Conversion Harness | eBay
Josh
For a little extra kick also buy this:
Overdrive 8 Groove Pulley Gain Output Idle IN Some Apps Ford Alternator 6G 3G | eBay
For the 3G, it's 94-97 7.3 Powerstroke
You'll need this pigtail adaptor:
Ford Alternator 6G TO 3G Conversion Harness | eBay
Josh
Thanks Josh for pointing that one out.
Sean
Fleet Owner
Joined: Apr 2012
Posts: 27,307
Likes: 549
From: Spanaway
Well.
All I can say is Grrrrr. 2 cells on the old battery that O'Reilly would
not replace are a bit lower on the specific gravity tester than the
other 4. It's the center 2 that are the low ones also.
I did try something that I would not normally do and that was to do a
normalizing charge. In other words a controlled over charge. Flooded
cell battery is 15.5 Volts till SG stops changing. It took about 3 hours
to reach that point. I was not happy with the results. I'll have to wait till
the next start to see if it did any good. If not it's a full set of new batteries.
Sean
All I can say is Grrrrr. 2 cells on the old battery that O'Reilly would
not replace are a bit lower on the specific gravity tester than the
other 4. It's the center 2 that are the low ones also.
I did try something that I would not normally do and that was to do a
normalizing charge. In other words a controlled over charge. Flooded
cell battery is 15.5 Volts till SG stops changing. It took about 3 hours
to reach that point. I was not happy with the results. I'll have to wait till
the next start to see if it did any good. If not it's a full set of new batteries.
Sean
Logistics Pro
Joined: Mar 2013
Posts: 4,097
Likes: 23
From: Kissimmee,Fla
Sean, somewhere on the net I got a site about rebuilding batteries, it worked like a charm on my stone dead battery in my Vette if your tight on cash. Google battery rebuilding and it will come up
Postmaster
Joined: Jan 2005
Posts: 4,424
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From: BC Canada
110 is the stock alternator, 140 is an upgraded one. You can either ask for the stock 140 (its not an upper of the dual, its available as the 63H upgrade). If you do a big case 3G to 6G, you need this harness that plugs to the new 3G with two plugs, and plugs into teh stock connector on the alternator which was for a 6G. This pigtail is part# W2740 apparently. Anyone have the part number for the alt in a 3 G 140 amp with the smaller 57 or 58 mm pulley, with 8 grooves?