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#1
04-22-2007, 03:34 PM
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1988 560SL Instrument Cluster gages peg with lights on
I have a 1988 560SL that recently suffered a windshird wipper transmission failure. After removing an replacing the instrument cluster to inspect the damage, the coolent temp fuel level and oil pressure gages all went heywire and the turn signal indicator lights stay on at all times, outside turn signals work fine. The oil pressure and water temp gages appear to work normal until any outside light is turned on. Normal headlights, park lights turn signals make these gages go to hard over full values. The fuel level just remains pegged at all times. It is possible that the damaged windshield wiper transmission contacted the light switch wiring and did some thing in the wire harness but it's too dificult to tell without pulling the harnass and I cant see how this would effect these other functions.
John Roncallo 
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#2
04-26-2007, 09:17 PM
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Quote:
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#3
04-27-2007, 07:27 AM
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A ground issue?
__________________
Len '59 220S Cabriolet-SOLD and living happily in Malta '83 240D 351,500 miles original owner-SOLD '88 560SL 41,000 miles - totaled and parted out https://sites.google.com/site/mercedesstuff/home '99 E300 turbo 227,500 miles '03 SLK320 40,000 miles - gave to my daughter '14 Smart electric coupe 28,500 miles '14 Smart electric cabriolet 28,500 miles '15 Smart electric coupe 28,000 miles 
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#4
04-27-2007, 07:55 AM
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A "ground" interruption of the printed circuit board on the back of the speedo is the most likely cause.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#5
04-27-2007, 09:05 PM
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Thank You gentelmen
I guess that leaves me with a shot gun approach of swaping out the instarment cluster from my 86 and and then trying to find the problem if that fixes it. John Roncallo
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#6
05-13-2007, 04:50 PM
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The Problem Found and my Fiz
If anyone is interested in what caused this problem and how to fix it, here it is. And thanks to all the gentelment that replied to this post and others on the SL forum.
560sl Instrument Cluster Wiring John Roncallo
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