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#1
12-21-2008, 10:58 AM
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Allen Kukla
I have a 1991 300 E gaser. The problem I have is when I turn on the headlights the blower motor drops to almost nill. It has an almost new alternator and battery??
Thanks and Merry Christmas all Al 
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#2
12-21-2008, 11:02 AM
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Quote:
Sounds like a ground problem. Jim
__________________
14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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#3
12-21-2008, 11:49 AM
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Could also be the blower regulator.
__________________
 1980 500SE/AMG Euro 1981 500SEL Euro 1982 380SEL 1983 300TD 1983 500SEC/AMG Euro 1984 500SEC 1984 300TD Euro 1986 190E 2.3-16 1986 190E 2.3 1987 300D 1997 C36 AMG 2003 C320T 4matic past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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#4
12-21-2008, 12:10 PM
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I would look at power distribution. Right off the battery there is a junction where all the term 30 leads start. In the wiring diagram look to the junction where leg "A" and "B" come from.
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Steve Brotherton Continental Imports Gainesville FL Bosch Master, ASE Master, L1 33 years MB technician
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#5
12-22-2008, 06:26 PM
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Put a volt meter on the battery, car running. Note the voltage.
Now, turn the on blower, again note the voltage Now, turn on the headlights, again note the voltage. You shouldn't see much of a voltage drop at the battery if the charging system and battery are ok. If you do, it's either the alternator, or the battery. I'd say that normal drop is probably less than a volt. You should never be below 12 volts when the car is running, and really you should be upwards of 13 volts. If you start out at 13 or above, and then drop down to below 12, then it's a systemic issue as described above. Now repeat the test but this time put the negative test lead to chassis ground. The results should be identical. If you get more voltage drop testing this way, then the problem is a ground. This is by no means an exhaustive or bullet proof test, but it will probably point you in the right direction. If you see no significant voltage drop when you put on the lights and blower, then the problem is somewhere downstream of the battery. -tp Last edited by tinypanzer; 12-22-2008 at 06:31 PM.
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