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  #1  
Old 01-10-2011, 12:25 PM
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Anybody know how to use EHA Test Harness?

I got the harness from MB, but I am not getting a reading...maybe I am doing something wrong here?

I know that we are looking for mA, so I put my probes inline using the connector but did not get a reading, so I am little confused. I opened the throttle too to see if the 0mA read was just where I was sitting, but even during WOT it did not move.


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  #2  
Old 01-10-2011, 01:29 PM
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If I recall correctly, you plug the 90 degree connector to the EHA, the male pin connector to the harness and read across the female pins of the third connector.
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  #3  
Old 01-10-2011, 08:10 PM
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That is what I did....weird.

Is there anything I need to do beforehand? Do I need to make the connection before starting the car or something silly like that?
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Old 01-10-2011, 09:44 PM
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Isn't in your workshop manual on your W124Zone site?
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  #5  
Old 01-10-2011, 10:09 PM
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Just covering the basics...

First, an ammeter and volt meter are used differently. Your multimeter should be rigged up so that you plug the red (+) cable into a different hole in order to be able to read amps.

Second, an ammeter is wired into the circuit so that the current flowing through the circuit (from +12 down to ground) flows through the meter to get where it's going.

So check the wiring of that test harness and follow the wiring. A basic jumper should look like this:
>---------------->

>---------------->

A jumper for measuring voltage should expose both wires, but maintain continuity
>-----------+---->
+----> test point

>-----------+---->
+----> test point

A jumper for testing amerage should break continuity for one line but not the other.
>-----------+---->

>---+ +---->
+----> test point1
+----> test point2

And your meter bridges the two test points together.

Having said all that, how much was that cable? I have the loose connectors, but haven't yet made the cable.

Thx -CTH
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  #6  
Old 01-10-2011, 10:16 PM
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Not sure this is going to help.



http://ww2.justanswer.com/uploads/rmillerphd/2008-04-18_210229_a1.pdf
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Old 01-10-2011, 10:25 PM
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Thumbs up

Hmm going to subscribe to this as I need to know more. I need to dial in my M117 and M103.
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  #8  
Old 01-11-2011, 01:11 AM
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The cable cost me $35....I heard they are no longer in production and stocks are low. It took over a month before it was in my hands. I figured I better grab one before they become non-existent.

I'll have another shot at it and hope I get a reading.
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