Anybody out there got the wiring diagram for this little dude?

I was having the typical intermittent problems with my tach so I opened the amp up to take a look. What I found was a couple of components burnt beyond recognition. So I would like to identify the items and replace them rather than dropping 80 bucks for a new one

Joe

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Joe

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1980 300SD - 495k miles - 'The Ambassador'
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Former Family Members
95 C280
73 280SEL
90 300D
87 300SDL (X2)
86 560SEL
84 300D
80 300SD

anyone have a schematic of the tachometer amp???

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ASE Master Mechanic
asemastermechanic@juno.com

Prototype R&D/testing:
Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician.
Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
HV-A/C Climate Control.
Vehicle build.
Fleet Durability
Technical Quality Auditor.
Automotive Technical Writer

1985 300SD
1983 300D
1984 190D
2003 Volvo V70
2002 Honda Civic

https://www.boldegoist.com/

Please? I need to get my tach working again.

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Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section

You got a bump becasue I am interested too.

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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

Does anyone have any pictures of the tach amp and location...The location may be different for different models. I am interested in pics and location of any models up to the early 90's....I probably have a number of them from the 123's and 126's .......thanks Jim

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James A. Harris

on my 82 123 I believe my tach works and reads accuratly, only draw back is one has to be holding the horn button to get the needle to move... anyone seen this before?

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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

I shall go take a picture of the one in my W123. It's the old style amp thats mounted on the inside of the fender opposed to remotly on the later vehicles.

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Adam Lumsden
(83) 300D
Vice-President of the MBCA International Stars Section

What year I think I have one for a 1978 300sd it would probably take a half hour of searching to find it which is ok if that will work for you I am pretty sure it is different than a w123 though.
Dave S

Tach amp for a '79 300SD is the same as my '83 300D its the miniture black garbage can on the drivers side front fender.

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

The w126 is a little black can on the driver’s side too it is just a third the size of a w123 amp let me see if I can find the W116 schematic

I don't know about a W126 amp....But my W116 amp works on my W123 perfectly well.

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
---------------------
"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

It wont let me upload it because it is over 2 megs it is a 4 page pdf file and I dont know how to cut up a .pdf file?
Dave s

Can somebody put it on their site and post a link at it?

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Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)

I will see if my son can in the early afternoon if he has time then I will post a link. MBZ.org used to have a section on fixing the amp you might try hunting there a little.
Dave S

I have half a dozen of 617-95X tested tach amps in my tool box. $20 delivered to your house.