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#1
07-23-2011, 03:02 PM
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Stange electrical problem
My car has a weird electrical issue. Every 4-5 months, I will notice that it is cranking slower than normal. When this happens, I have about 3-4 more starts before I have to put the battery on a charger. This car is driven regularly, so it isn't from the battery self discharging from lack of driving. The alternator does seem to work, but I'm not convinced that it is performing as it should. With the blower on high, you can hear the blower speed up when you bring the engine to a fast idle. The only thing I can think of is something is wrong with the voltage regulator, but that is sort of a guess. Anyone have any ideas?
__________________
1984 300D Euro spec, 5 speed 217,000 miles 
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#2
07-23-2011, 03:35 PM
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Exactly the symptoms on mine until I changed out the voltage regulator. The brushes were down to the nubs. No problems after that.
Easy to check and easy to replace, just check the voltage output to the battery.
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#3
07-23-2011, 04:49 PM
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Get yourself one of those cheap voltmeters which plugs into the cigarette lighter and remove all doubt.
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1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#4
07-23-2011, 04:53 PM
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I've seen as low as 10.8 volts at idle with the headlights on and the blower on high.
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1984 300D Euro spec, 5 speed 217,000 miles
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#5
07-23-2011, 05:00 PM
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Too low.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#6
07-23-2011, 05:15 PM
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Here's what you do: go to your nearest Autozone type store, and have them come out and do a free electrical test on the car. They walk you through the paces of starting, full loads on, running, stopped. Then they tell you the condition of your battery and alternator, and give you the paper tape printout from the handheld computer.
Free!
__________________
Cheers! Scott McPhee 1987 300D
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