1967 M129 in W111...

Don't know what this little guy is or does. Relay or Voltage regulator? At any rate, with the car running, just started, it gets RED HOT on the bottom end which can't be a good thing. Seems the harness breaks out from it to the alternator which, was replaced by the P.O.

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Present
1971 280SE W108

1967 250SE W111
Rhode Island
_____________
Auf Wiedersehen
1972 280SE 4.5 (AKA Das Moneypitten)
1972 250C (Mit den zwei carburetors from hell)

"Time fly’s like an arrow, fruit flies like a banana" Groucho Marx

Yes, it is.

And if it gets hot enough to burn your hand, you have either an overcharging alternator or an overload on the system, I'd think.

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Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k

Do you have a voltmeter handy? Check the voltage between the battery terminals with the engine off, and again with it running. It should be ~12v when off, and ~14v when running.

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1973 280 - Current Project Car
1979 240d - 100% Stock
1982 380sl - 100% Stock
1985 190e 2.3 - Heavily Modified

I've got 14 across the battery with the car off and around 14.3 running. Wierd.

__________________
Present
1971 280SE W108

1967 250SE W111
Rhode Island
_____________
Auf Wiedersehen
1972 280SE 4.5 (AKA Das Moneypitten)
1972 250C (Mit den zwei carburetors from hell)

"Time fly’s like an arrow, fruit flies like a banana" Groucho Marx

Not wiered...just that you are taking measurment too early after shutting off engine.
The voltage should read 12.6 to 12.8 on a fully charged diconnected battery but only 20 minutes or more after it was in service..
Here's a link to better explain...http://xtronics.com/reference/batterap.htm


.

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[http://languageandgrammar.com/2008/01/14/youve-got-problems-not-issues/ ]

"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."

Learn something everyday here. Thanks!

__________________
Present
1971 280SE W108

1967 250SE W111
Rhode Island
_____________
Auf Wiedersehen
1972 280SE 4.5 (AKA Das Moneypitten)
1972 250C (Mit den zwei carburetors from hell)

"Time fly’s like an arrow, fruit flies like a banana" Groucho Marx

That is definitely an old-style voltage regulator. I would check the ground, and if it is OK, replace the unit. Bosch makes a solid state VR with a little cover on it that looks sort of like the old style.

Here is a link to some research I did on VR's.

http://www.sl113.org/forums/topic.asp?TOPIC_ID=5964

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Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe

Chuck, that's a nifty article on the charging system. Simple enough so that I could grasp most of it. Thanks.

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Milterino
76 450 S.E.L.