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Old 09-14-2016, 01:17 AM   #1
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Default Roadmaster Alternator Question ?

When my 93 Roadmaster was in the shop getting the AC changed over , the mechanic (a very good mechanic by the way) told me he checked the alternator and it was iffy . I'm thinking get it changed out before the cold weather hits ? Any recommendations ? I don't want to put any Chinese junk in it and I would prefer new over rebuilt . So any advise ?

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Old 09-14-2016, 02:52 AM   #2
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ACDELCO 3351040 $85.89 at Rockauto
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Old 09-14-2016, 03:39 PM   #3
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ACDELCO 3351040 $85.89 at Rockauto

Thanks for the quick response I really appreciate it . That'* the exact one I picked out but I wasn't sure of the 100 amp vs the 105 amp . So I gather the 105 amp is better ? About the same ?

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Old 09-14-2016, 03:52 PM   #4
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Very welcome.
They are pretty much the same, a few more amps is a good thing though.
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Old 09-14-2016, 04:31 PM   #5
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Don't forget to use the Rock Auto discount code for 5%:


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Old 09-14-2016, 10:15 PM   #6
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I checked on line as to the life expectancy of the GM serpentine belt , they said 10 years or 150,000 miles . I have 39,000 miles on it now but it'* 23 years old so I ordered the AC Delco belt too . Naturally it was the most expensive , hopefully none of these are Chinese parts .

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Old 09-15-2016, 02:51 AM   #7
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Now days it is hard to tell where the part is actually made, as most just attach their company label to it.
Chinese or not so far I have not had any issues using anything AC Delco labels as theirs.

After that many years deff a good idea to replace the belt while you are at it.
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Old 09-29-2016, 09:45 PM   #8
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Got it installed and it'* working as it should , it'* reading a hair under 14 volts on the dash now when I'm running down the road . When I shut it off it'* at 12.5 to 12.6 , then over night it will drop down to 12.1 . What do you think ? Every thing OK or should I have the battery checked ? It has a Sears die hard gold in it from the PO .

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Old 09-30-2016, 04:13 AM   #9
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Got it installed and it'* working as it should , it'* reading a hair under 14 volts on the dash now when I'm running down the road . When I shut it off it'* at 12.5 to 12.6 , then over night it will drop down to 12.1 . What do you think ? Every thing OK or should I have the battery checked ? It has a Sears die hard gold in it from the PO .

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I'd have the battery tested, I think mine is around 14.6v or 14.7v when the alternator is doing its thing, ut never really drops below 12.4v or 12.5v when the car sets though.

12.1v is like a 26-27% charged battery.

Here is a good little read on batteries, charge, load testing, etc...

CARQUEST Batteries - Basic Rules for Battery Care & Maintenance
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Old 09-30-2016, 06:51 PM   #10
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Since the battery is it is a Diehard Gold , I stopped at Sears today to have it checked and sure enough it is bad . The car runs and starts fine , but when I checked it with my Fluke 87 it looked iffy to me . They quoted me $169.28 to buy in store and have it installed . If I buy on line pick up at store and install myself , with the $5 in bonus points it'* $98.04 .


Take a wild guess which route I'm going to take .

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