|
|
|
#1
|
||||
|
||||
x26 connector, where are u?
Im trying to find x26 connector on my 1987 300D, but i cannot find it. Im tackling the job with the rpm guage not working, and i was following some guys thread about checking AC voltage at the diagnostic box, right at the battery (pin 2 - positive lead, ground - neg lead) I dint get anything, so im trying to find out if the wires are damaged from the x26 connector to diagnostic connector.
It should be under the fuse box, but there are only 2 connectors with only 2 or 1 wire coming in and going out (x26 had to have 12 wires). Please help...
__________________
1987 Mercedes Benz 300D Turbo Black/Black |
#2
|
||||
|
||||
Quote:
If the tach works, you have a bad tach amp, which is the #1 cause of an inoperative tachometer. P.S. Takes less time that looking for X26 too...FWIW
__________________
Did you just pass my 740 at 200 kmh in a 300SD????? 1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership |
#3
|
||||
|
||||
Quote:
Jeremy
__________________
"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
#4
|
||||
|
||||
Quote:
Guess I spend all my time working on the old ones!!!!! You are correct, the 10amp fuse in the OVP can cause a lot of issues....Robert
__________________
Did you just pass my 740 at 200 kmh in a 300SD????? 1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013 100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership |
#5
|
||||
|
||||
I was about question Bert about that... thanks jeremy. I know its not the tach itself, because i switched from my e320 94' (e320 tach works) cluster to my 87', but it did not work, so it has to be wiring problem :/
__________________
1987 Mercedes Benz 300D Turbo Black/Black |
#6
|
||||
|
||||
Update: Fuse is intacted on OVP(5 pin), measured pins 31 (+) and 30 (-) *diode test on my voltmeter* and got 800, but if i do the opposite i get infinite. So I gave pin 15(+) or 31(-) 12v. Then i ohm/diode tested pins 30 and 87 to see if the switch closed, i got nothing. What do you guys think? Did i test it correctly?
Here is a diagram:
__________________
1987 Mercedes Benz 300D Turbo Black/Black |
#7
|
||||
|
||||
Quote:
You can try connecting pins 30 and 87 in the socket for a test; if the tach suddenly decides to work, the problem is definitely the relay. To do this test, start the engine and have someone watch the tach while you use a wire to connect for a few seconds pins 30 and 87. Jeremy
__________________
"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
#8
|
||||
|
||||
you were right, connecting 30 to 87 pins helped. Tach all the way to the red (probably bad tach, still works) and rpm went up (~200 or so). Time to invest into new OVP
Thanks!
__________________
1987 Mercedes Benz 300D Turbo Black/Black |
#9
|
||||
|
||||
LOL as predicted (thanks jeremy!) tach works and increase of idle was noted... but the tach goes ALL the WAY to the red... seems like a defected tach. I'll try use a cluster from my e320 94', see if that has something to do with tach being broke or the signal (i hope its only the tach)
__________________
1987 Mercedes Benz 300D Turbo Black/Black |
#10
|
||||
|
||||
If the tach was from a different vehicle (I forget where you are in your parts swapping) it may not work properly in your diesel. I've never explored what the signals look like but gasoline and diesel models may be very different.
Jeremy
__________________
"Buster" in the '95 Our all-Diesel family 1996 E300D (W210) . .338,000 miles Wife's car 2005 E320 CDI . . 113,000 miles My car Santa Rosa population 176,762 (2022) Total. . . . . . . . . . . . 627,762 "Oh lord won't you buy me a Mercedes Benz." -- Janis Joplin, October 1, 1970 |
#11
|
||||
|
||||
On 124s the gas and Diesel tachs are definitely different.
Gas tach in a Diesel pins at 7k as soon as you crank the engine. Found this out the hard way.
__________________
The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
#12
|
||||
|
||||
My OVP internal relay went faulty, so I wired a normal silver 20A M.B. relay in its place and attached it to the case of the OVP...
The coil of the original relay was O/C Saved trying to find one and the cost!
__________________
http://i190.photobucket.com/albums/z...0TDnoplate.jpg Alastair AKA H.C.II South Wales, U.K. based member W123, 1985 300TD Wagon, 256K, -Most recent M.B. purchase, Cost-a-plenty, Gulps BioDiesel extravagantly, and I love it like an old dog. W114, 1975 280E Custard Yellow, -Great above decks needs chassis welding--Really will do it this year.... |
#13
|
||||
|
||||
So im guessing I have to get a tach from a diesel w124 in order for it to work? Anyway to spot a diesel vs gas tach? no red rpm line?
I had the original cluster but the dome light mounting inside was burned beyond repair so my dad got used cluster from gas w124... plus he threw out the original cluster (big mistake) so i cant retro fit it into the new cluster that he bought -_-
__________________
1987 Mercedes Benz 300D Turbo Black/Black |
Bookmarks |
|
|