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#1
05-28-2010, 03:52 PM
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Wonky Tach Amp!
So, years ago when I purchased my '82 300 SD, the tach amp did not work so I removed amp, did the spacer trick, screw amp back in and it worked for several months and then died. Fast forward four years, I purchased an amp off EBay that worked perfectly for a day and then had bouncing needle syndrome though tach always worked, very stable at idle. Last week, I was at a PicknPull and found an amp and installed and voila, it worked perfectly with no needle bounce! Two days later, died completely! Any theories after reading the above?
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#2
05-28-2010, 06:25 PM
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The spacer trick is just a band-aid. You can buy all sorts of "stuff" on ebay. The local P'N'P unit is just as old as yours.
Just a suggestion, contact Techguy512 here on the forum.
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83 SD 84 CD
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#3
05-28-2010, 11:39 PM
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Hmmm
Quote:
Look at the plastic around the pins, if it is crumbling = replace the sensor.
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#4
05-29-2010, 02:31 AM
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Quote:
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#5
05-29-2010, 08:47 AM
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The end circled is at the end of the amp, in the bottom of the socket.
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83 SD 84 CD
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#6
05-29-2010, 10:29 AM
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Quote:
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#7
05-29-2010, 11:25 AM
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Yeah, here are a couple of pics. The end with three female sockets fits into the bottom of the plug bolted to the inner fender.
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83 SD 84 CD
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#8
05-29-2010, 02:41 PM
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Excellent post!!!!!
__________________
 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 
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#9
05-30-2010, 05:13 PM
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Quote:
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#10
05-31-2010, 10:21 AM
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You're welcome.
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83 SD 84 CD
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#11
05-31-2010, 10:26 AM
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I placed a 3/4" OD 1/8" thick nylon washer on top the potting and now the tach works correctly.
Guess I need a new amp.....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
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#12
06-09-2010, 11:59 AM
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Still working perfectly....
__________________
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
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#13
06-09-2010, 12:25 PM
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I went through a series of "band aid" solutions here too like folded pieces of mech-towels, which worked for about a month each, then I went on to cut round pieces of thin laminating plastic, which also lasted for about a month, then I thought that rubber might work better... as soon as I screwed on the top I heard this crunching noise and I knew that I had just killed the amp, so I went to my PNP and got another one, which worked for a couple of days. Then it started to go intermittent too (sigh). I patiently folded a piece of mech-towel and it's been working good ever since. Now I know what to do when that stops working...
 Good post.
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[/SIGPIC]~cirrusman 1983 Mercedes Benz 300SD - Wife calls him "Chitty Chitty Bang Bang" [SIGPIC] 1983 Toyota Tercel (Tommy, The little Toyota that could) 1965 Ford F100 (Grandma Ford) 2005 Toyota Sienna (Elsa, Wife's ride) Gone: 1988 Toyota Pickup 2004 Subaru Outback 1987 Cadillac Fleetwood Brougham 1986 Volvo 740 GL Station Wagon - Piece of junk. 1981 Volvo 242 DL 2 Door - Hated to see it go. R.I.P.  1987 Pontiac Fiero GT
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