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Old 12-19-2004, 12:29 PM
Registered User
Join Date: Nov 2003
Posts: 32
Over Voltage Relay

I have not been able to find this relay. I have a 1986 300SDL the had a battery short and I have lost several things and have had threads suggesting that as a problem. Sure would appreciate any help.

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Old 12-19-2004, 12:42 PM
Ta ra ra boom de ay
Join Date: Jun 2004
Location: Pittsburgh
Posts: 1,915
Looks like this:

On my 124 it is behind the battery under a loose cover. Not exactly sure on your 126.

1986 300E 220,000 miles+ transmission impossible
(Now waiting under a bridge in order to become one)

Reading your M103 duty cycle:
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Old 12-19-2004, 06:05 PM
Gilly's Avatar
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Believe it's between the double firewall about in the middle, maybe more towards the battery.
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Old 12-20-2004, 03:04 PM
Join Date: Aug 2000
Location: Holland, MI
Posts: 1,316
In my 86 SDL it's rear of the engine compartment, between the brake master cylinder and the engine. The red top makes it obvious.

Best Regards,
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Old 12-20-2004, 04:05 PM
Registered User
Join Date: Nov 2003
Posts: 32

I appreciate the information. I had no idea what to look for. There are so many different safty items, guess I should break down and buy the CD so I can find these things, just don't have many problems though.
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Old 12-20-2004, 09:53 PM
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Join Date: Jul 2004
Posts: 7,381
Found mine last night in the fuse box- a new fuse in it cured my tach not working and the ABS light always on. '85 SD

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