Updated link:

BOSCH Voltage regulator mod

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

X2 on this mod I've used it in the past and works great a bit of additional redding if anyone cares to.

CAR BATTERIES ARE NOT 12 VOLTS

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

One thing to bear in mind is to be sure your digital volt meter (DVM) is accurate! I have 4 DVM's and they all read different, some by as much as 1 volt. What do you use as a reference to calibrate your DVM?

Also, the voltage measurement should be taken at the battery, not the cigarette lighter, where there will be a small voltage drop.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked

Thanks! I put it in with My Notes.

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84 300D, 82 Volvo 244Gl Diesel