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#1
10-21-2011, 11:41 PM
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Broken down in Virginia - alternator?
Hey all,
It's 11:30 now, I was on my way from NC to MD for a wedding, when my '77 300d's instrument lights started fading. It was turning on the heat that did it, then the radio went out, then the HEADLIGHTS went out on the interstate. I think I'm at mile marker 273 on northbound I-81. Anyway, pretty sure it's the alternator. Does anyone have a recommendation for alternators? That is, I seem to remember there are certain ones to avoid and ones that work well. There aren't a lot of parts stores around here to choose from, but there is a NAPA. Anybody out there had to replace one in a 300? I've heard they're a PITA. Thanks in advance for your $.02 Brian 
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#2
10-22-2011, 02:24 AM
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How Many miles on your Voltage Regulator ?
That's a quick easy fix.
(Although not on the side of a darkened interstate.) Parts from NAPA's website [If there's any way you can get a trickle charge on the Battery Overnight... it'll make the replacement Alt's job easier. (They're not meant to "Bring a Battery from death's Door]
__________________
'84 300SD sold 124.128
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#3
10-22-2011, 06:26 AM
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When morning comes, can't you get a jump start and drive back home with no electrics?
__________________
-Evan Benz Fleet: 1968 UNIMOG 404.114 1998 E300 2008 E63 Non-Benz Fleet: 1992 Aerostar 1993 MR2 2000 F250
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#4
10-22-2011, 07:13 AM
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are you on interstate 81/If so how far from Tennessee?
__________________
1999 w140, quit voting to old, and to old to fight, a god damned veteran
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#6
10-22-2011, 08:30 AM
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I would buy a voltage regulator which is easily replaceable and has only two screws.
What town or city is close to mile marker 273?
__________________
Regards Warren Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL ENTER > = (HP RPN) Not part of the in-crowd since 1952.
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#7
10-22-2011, 08:45 AM
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Warren, the town here is Mt. Jackson. The guy who runs the service station next door is not friendly to a weary traveler! The next town south is New Market. I'm 30-50 miles south of Winchester.
How can you tell if it's the voltage regulator vs. the alternator? The guy at the shop here won't help at all. Also, how far can I go (estimated) on a full battery charge with no alternator during the daylight hours in a 300d? Anyone ever tried it? Thanks.
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#8
10-22-2011, 08:52 AM
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Since it's a diesel, you can go for miles and miles. See if you can remove the regulator, two screws, and look at the brushes. If they are really short it needs a new one.
__________________
Regards Warren Currently 1965 220Sb, 2002 FORD Crown Vic Police Interceptor Had 1965 220SEb, 1967 230S, 280SE 4.5, 300SE (W126), 420SEL ENTER > = (HP RPN) Not part of the in-crowd since 1952.
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#9
10-22-2011, 08:54 AM
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Quote:
 Forever if you never shut the car off and don't care about brake lights...-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#11
10-22-2011, 09:21 AM
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The voltage regulator is on the back of the alternator. If you look at the images CI posted you'll see it, in the 2nd one it's the black box on the top:
 The small box on the bottom is a capacitor which filters out noise so the radio doesn't whine. -J
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