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  #1  
Old 10-10-2010, 05:23 PM
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Lost Gauges om instrument panel :crybaby2:

1990 300SE 217k miles

Hello everyone, went shopping at Costco today and when I left I noticed that non of my gauges works, the only one that works is the economy gauge which I understood works on vacuum.

When I arrived home i opened fuse box and a buzzing noise is heard from there so I am assuming it is a relay issue.

Does anyone have an idea???


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  #2  
Old 10-10-2010, 05:27 PM
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Check fuse # 5 in the engine compartment.
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  #3  
Old 10-10-2010, 09:15 PM
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Thanks mbzman, not a fuse.
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Old 10-11-2010, 01:02 AM
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I'm in the same boat as you. I lost my tach and oil pressure after I removed the cluster to repair the odometer. Your issue sounds more sudden and severe. A bad instrument board perhaps? Makes sense that there is a electrical fault with everything but the economy gauge not working.
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  #5  
Old 10-11-2010, 12:08 PM
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Bad solder joint, bad ground, or you omitted the screw that connects the ground straps on the back of the cluster.
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1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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  #6  
Old 10-12-2010, 09:10 AM
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I was able to locate which relay was it. It is the second large relay in the fuse box right near the lights relay, anyone knows what is it and if it is repairable?
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  #7  
Old 10-12-2010, 01:15 PM
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Pop it open and inspect for cracked solder joints, which seem to be nearly everywhere on these cars.
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1990 300SE "Corinne"- 145k daily driver - street modified differential - PARTING OUT OR SELLING SOON - PORTLAND OR. AREA - PM ME FOR DETAILS
1988 560SEL "Gunther"- 190K passes anything except a gas station
1997 S420 - 265k just bought it with a rebuilt trans. Lovely condition
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  #8  
Old 10-12-2010, 04:31 PM
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I did open it up yesterday, looks nice and neat, no solder breaks, maybe a burned resistor or diode but its way beyond my skill. Ordered used one from eBay for 30 bucks delivered.
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  #9  
Old 10-13-2010, 10:09 AM
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relay

Hope that solves your issue. If not, then it was a grounding issue. I have a quick fix for that if you need it.
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  #10  
Old 10-25-2010, 07:06 PM
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Need help

Just replaced the relay module, Nothing changed, same buzzing sound and no gauges, Does anyone have a clue what might cause it? where to look? it came out of the blue sky, I did nor tuch or remove instrument panel and did not perform any work on the car.
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  #11  
Old 10-26-2010, 06:43 AM
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Any experts here today?
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  #12  
Old 10-26-2010, 10:52 AM
david s poole
 
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give me a call so i don't need to type all the instructions.---4696880422.
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1987 Mercedes Benz 420SEL
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2000 Mercedes Benz C280
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  #13  
Old 11-07-2010, 09:55 AM
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Thank you david s poole for taking your time and trying to help a stranger.

I finally solved the problem.

Someone suggested fuse number 5 and I checked, also checked rotated all fuses to improve contact. After spending time and money trying to solve this problem it turned to be fuse number 6, these fuses can have hairline breaks and I sure missed it even when looked " carefully ".


Buzzing relay stopped as soon as I replaced fuse number 6 and all gauges resumed working.
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  #14  
Old 11-07-2010, 12:12 PM
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Just happened to me two days ago but it was my fuse #5 and it was visibly melted. Not sure what caused it but put a new one in and so far so good. maybe I'll pop in a new #6 as well now just in case.

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