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Old 12-28-2009, 02:52 PM
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What is this?

Someone told me awhile what this is and how it is used, but in my travels that information has slipped my mind. Could someone inform me what this is that I am pointing to? In my 85 300D it's located directly on the driver's side of the engine bay towards the front of the car.


Also I'm guessing that the black box below it is the glow plug relay and strip fuse.

Thanks!

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Old 12-28-2009, 03:00 PM
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It looks like where older models have a tach amp.Maybe service centers read rpms from there.
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Old 12-28-2009, 03:00 PM
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That is the thing that reads your engine RPM and displays it on the dash.
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Old 12-28-2009, 03:05 PM
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Quote:
Originally Posted by ohiomike View Post
That is the thing that reads your engine RPM and displays it on the dash.
Only on the older models.
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Old 12-28-2009, 03:06 PM
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Quote:
Originally Posted by okyoureabeast View Post
Someone told me awhile what this is and how it is used, but in my travels that information has slipped my mind. Could someone inform me what this is that I am pointing to? In my 85 300D it's located directly on the driver's side of the engine bay towards the front of the car.


Also I'm guessing that the black box below it is the glow plug relay and strip fuse.

Thanks!
Yes, that is the tach amp, and the box below is the GP relay (including the strip fuse).
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Old 12-28-2009, 03:16 PM
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Now I don't want to seem foolish here, but that is a cap and I can screw it off.

Inside there are tiny little holes in a semi circle numbered 1 through 6 and a couple of flat holes below the semi circle.

Is it just a diagnostic port? I can take a picture of it and show you guys what it looks like on the inside.
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Old 12-28-2009, 06:08 PM
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Quote:
Originally Posted by okyoureabeast View Post
Is it just a diagnostic port? I can take a picture of it and show you guys what it looks like on the inside.
Yes. On older models the tachometer amplifier plugged in there, yours is just empty.
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Old 12-28-2009, 06:23 PM
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Yes. On older models the tachometer amplifier plugged in there, yours is just empty.

Cool! Thanks for the information
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Old 12-28-2009, 06:25 PM
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Quote:
Originally Posted by okyoureabeast View Post
....
Is it just a diagnostic port? ....
Not really a diagnostic port. Just a service port to check the RPMs.


.

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