1981 300SD

Please see attached pics. When I try starting the car it will not turn over at

all. This part ...makes fairly loud ticking noise instead.

Any advice what this is and what is issue?

Thanks.

Austin

Attached Thumbnails

   

__________________
'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

That's the glow plug relay. Sounds like yo uhave a bad battery or bad connections.

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Glow plug relay

I believe I charged battery fully yesterday...any idea what shows up if I have a bad glow plug relay ?


......................

__________________
'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

The relay has a strip fuse, remove and carefully inspect it for hairline cracks.

Measure voltage there too.

__________________
83 SD

84 CD

The clicking is an effect, not a cause. It occurs when voltage is low. Could be a bad connection. Have you load tested the battery?

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13

Have not tested ..It is fairly new Interstate battery...

...

__________________
'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

these might help.

Attached Files

	w126 checking preglow system p1 of 2.pdf (530.5 KB, 168 views)
	w126 checking preglow system p2 of 2.pdf (502.6 KB, 193 views)

__________________
1972 280SE 4.5

Can you describe where the strip fuse is?

Thanks,...

........

__________________
'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

OP mentions it won't turn over at all? I wouldn't be looking at that relay...

__________________
1989 300E 144K

It's what's under the two gold colored screws at the left side of the box in your first picture at the start of this thread.

__________________


~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL

I suggest taking a good close look at the battery terminals. Make sure they're clean, if not, take a wire battery brush to them. Make sure they're clamped down very tightly.

__________________


~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL

Must add..not sure if there is any connection to relay issue ..

Last weekend noticed electrical issue . After a 1 hr highway drive At stoplight the Radio/tuner went on/off/on/off /etc .....This never happened before.


...

__________________
'87 924S
'81 280SEL

Sold ->

81 300SD -
93 300E w/ 3.2
85 300D-
79 300SD
82 300CD
83 300CD - CA
87 190E 5 spd
87 Porsche 924S

"..I'll take a simple "C" to "G" and feel brand new about it..."

Unlikely connected to the relay, EXCEPT that both that, as well as the relay, are BOTH symptoms, in my opinion, of a "larger problem". They're both effects and neither is the cause. This has every sign of being a battery that can't support the electrical system, your protests about recent charging and battery newness notwithstanding. Might be a bad battery, might be a bad battery connection, and might even, I suppose, be a starter that has failed and is drawing an extreme amount of current. Maybe a failed alternator.... I'm just shotgunning at the moment but I think it's very likely to be an overall "not enough battery current" problem. Whatever the cause is.

Put a volt meter on the battery just as it sits out there and tell us what it reads. Then try to crank the car a time or two and read the voltage while you're attempting to crank.

__________________


~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL

x25

__________________
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13