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Old 03-12-2003, 07:43 AM
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Join Date: Mar 2003
Posts: 64
EHA current measurement harness


Does someone have a diagram on the harness used to measure current at the EHA?

I'm guessing that one of the two wires is cut in half and a ampmeter is put across the wire in series. Is that right?

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Old 03-12-2003, 08:10 AM
Posts: n/a

In the time it takes to make one, you'd spend less money just getting it from the dealer. I believe they are about $15. If you can wait a few days, call Fastlane.


PS: Do a search on EHA and harness and you'll probably get the part number.
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Old 03-12-2003, 10:26 AM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
Yes, that is how it is wired.
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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Old 03-12-2003, 01:09 PM
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Join Date: Dec 2001
Posts: 565
Photo in this thread:

M103 EHA/Lambda Adjustment HELP
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Old 03-12-2003, 01:45 PM
Senior Member
Join Date: Sep 2002
Location: So. Calif.
Posts: 323
or . . . you can do it the EZ way . . . by moving the plug over so 1 EHA pin and 1 HARNESS SOCKET are exposed to connect your meter to . . .
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Old 03-12-2003, 05:48 PM
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Join Date: May 2000
Posts: 376
Three wires with alligator clips on each end and your in business.

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Old 03-15-2003, 11:54 PM
Bruce B's Avatar
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Join Date: Dec 2002
Location: east of Atlanta, north of Macon Ga
Posts: 185
Whereizzit ??

Slight change in topic if I may......but where is the EHA located. I'm sure mine is working well but a gas fume problem I'm having and several suggested looking for leaks at the EHA.

THANKS in advance.
1991 300SE (my ride, 279,000 miles, looks almost new
1954 Cadillac (21 yo son's car, he bought when age 15)
1972 SeaBird 19 ft runabout (old but solid, slant six, Volvo sterndrive perfect condition, undergoing complete overhaul and refit)
1998 Toyota Rav4 (my sons daily driver when he is in the Continental US, PROUDLY serving in US Navy)
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Old 03-16-2003, 08:27 AM
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Join Date: Oct 2002
Location: Toronto, Canada
Posts: 700
I built my own harness, extended it to the cabin so I can monitor the eha while driving, figured out most problems with my car like that. Also did the same with maf.

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Old 03-18-2003, 10:05 AM
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Join Date: Sep 2001
Location: Austin, TX
Posts: 563
The EHA is screwed into the side of your fuel distributor, underneath your air cleaner.

it looks like;
Mike Heath
1988 560SL Black/Palomino
1988 300SEL Black Pearl/Burgandy
1984 500SEC Anthracite Grey/Palomino
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