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#1
12-04-2007, 10:20 PM
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Alternator Question
Hi,
Had a (hopefully) quick question... I just replaced the alternator with a Bosch 65a today...took it to Autozone to have them test it after I had taken the battery to have it charged there and reinstalled it...alternator was charging at 13.9v but the amps looked low to the guy doing the testing...37.5 at idle I had nothing else on, other than the clock on the radio and the heaters from my fattywagon kit (total of 16a draw from both). I don't know what he was thinking, because when I asked him what numbers he was looking for.. he said.." oh, 160 or 170..."?!?!?!?! Anyway, that would be fine I guess if you had three alternators... My question is what should the amps be reading at idle with or without the 16amp draw from the heaters? Is the alternator doing it's job? Or is it back to NAPA tomorrow with the bad one? reverendxlt
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Reverendxlt 1985 300TD 
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#2
12-04-2007, 10:30 PM
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if his testing machine was forcing a power output from the alternator, then it would be whatever his machine was drawing, but I hope he did not force a 60 amp alternator to put out 170amps, cause then you need another alternator.
if he was just measuring the draw from your system, then it depends on the condition of your battery, and the amount of items pulling a load. 35 amps sounds ok, if your battery is moderately discharged.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!!  1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#3
12-04-2007, 10:38 PM
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37.5 at idle sounds pretty good for a 65A alternator....the output goes up with the speed. At 2000 rpm it can probably churn out nearly 70A
Edit: I see you were talking about current use of the car. 37 seems a bit high at idle with nothing much on...though those heaters could draw quite a bit...still seems a little high.
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-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#4
12-04-2007, 10:40 PM
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thanks, I appreciate your help
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Reverendxlt 1985 300TD
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