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#1
03-26-2007, 12:46 PM
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Non Working Tach on a 124
My searches have told me that it could be the tach amp. But other posts implied the 124 doesn't have an amp. Does it or doesn't it? If it does have one, where is it? Also noted posts that referred to a connection of some sort behind the battery. Is this a fuse, relay or ground? TIA
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 Muleears '07 E320 Bluetec 133K my DD '04 Jaguar XJ8 VDP, 34K '10 Hyundai Accent 60K Grocery Getter '02 VW Golf soon to be on the road again '97 E300 Diesel Son's DD '61 VERY tolerant wife Hampton Roads, VA USA Gone but not forgotten: '67 250S 95K '86 300SDL '87 300D Turbo, 364K! R.I.P. '98 E300 Turbodiesel, 213K '02 S420, 164K '01 Prius 138K 
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#2
03-26-2007, 02:42 PM
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Is the AC working?? Is the idle rough??
It could be the OVP if the AC and Idle are off. It is located behind the battery. While the car is running press on the OVP, move it around a little bit. If the Tach comes back on this will be your problem. Retail (Steakership) about $95.00. Joe
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www.jerseyplanning.com 1987 300TD 440K - My car 2005 Jeep Grand Cherokee Laredo 107K - Tim's car 2000 - CLK320 100K - Deb's car 1994 C230 150K - Josh's Car
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#3
03-26-2007, 08:50 PM
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blower fan works
but the AC doesn't. Would you try an OVP from a junkyard? Idle is OK.
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Muleears '07 E320 Bluetec 133K my DD '04 Jaguar XJ8 VDP, 34K '10 Hyundai Accent 60K Grocery Getter '02 VW Golf soon to be on the road again '97 E300 Diesel Son's DD '61 VERY tolerant wife Hampton Roads, VA USA Gone but not forgotten: '67 250S 95K '86 300SDL '87 300D Turbo, 364K! R.I.P. '98 E300 Turbodiesel, 213K '02 S420, 164K '01 Prius 138K Last edited by muleears; 03-27-2007 at 06:12 AM.
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#4
03-28-2007, 12:09 PM
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A junkyard PVP might be ok. Make sure you can take it back if it doesn't. Did you try pressing on the OVP while the engine is running? Did the tach come back on?
__________________
www.jerseyplanning.com 1987 300TD 440K - My car 2005 Jeep Grand Cherokee Laredo 107K - Tim's car 2000 - CLK320 100K - Deb's car 1994 C230 150K - Josh's Car
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#5
03-30-2007, 09:34 AM
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Swapped OVP with known good one. No impact on tach. My idle is good. Do I have a tach amp? Could it be the RPM sensor, or the tach itself?
__________________
Muleears '07 E320 Bluetec 133K my DD '04 Jaguar XJ8 VDP, 34K '10 Hyundai Accent 60K Grocery Getter '02 VW Golf soon to be on the road again '97 E300 Diesel Son's DD '61 VERY tolerant wife Hampton Roads, VA USA Gone but not forgotten: '67 250S 95K '86 300SDL '87 300D Turbo, 364K! R.I.P. '98 E300 Turbodiesel, 213K '02 S420, 164K '01 Prius 138K
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#6
03-30-2007, 08:25 PM
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I had the same problem on my '92 2.5turbo. No tach and the compressor was not pulling in. Installed a brand new overvoltage protection relay and everything went to working
 . Man I like an easy repair .
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Jim
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#7
03-30-2007, 09:05 PM
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You did check the fuse on the OVP?
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 Gone to the dark side - Jeff
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#8
04-14-2007, 06:58 AM
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Fuse on the OVP was good. I now have a tach sensor, I'll replace that and see what happens.
__________________
Muleears '07 E320 Bluetec 133K my DD '04 Jaguar XJ8 VDP, 34K '10 Hyundai Accent 60K Grocery Getter '02 VW Golf soon to be on the road again '97 E300 Diesel Son's DD '61 VERY tolerant wife Hampton Roads, VA USA Gone but not forgotten: '67 250S 95K '86 300SDL '87 300D Turbo, 364K! R.I.P. '98 E300 Turbodiesel, 213K '02 S420, 164K '01 Prius 138K
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