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  #1  
Old 01-07-2009, 12:00 AM
rjk's Avatar
rjk rjk is offline
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Location: Atlanta metro area
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560SL electrical fault

Hi all,

'89 560 SL
fine yesterday.
today have lost some electrical (dash gauges, windows, directionals).
I DO have headlights (hi & low), radio, int. lights, emerg. flashers, dash lights, engine works so I assume engine management is live as well.
checked fuses, they are all good.
checked voltage and many fuses have no voltage present on either side including fuse #13.
I checked under the hood and there is voltage present at the large gauge wires on the passenger side.
so, where do I start?
I want to be able to start a focused search and avoid wasting a lot of time running down blind alleys so any help would be appreciated.
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1999 E320 (gave to daughter) 250K
1994 F150 (new engine installed!) 240K
1989 560 SL (Refreshing top end) 150K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (awaiting engine diagnosis) 349K
1986 242Ti (fallow)
1968 GT500KR (under restoration)
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  #2  
Old 01-07-2009, 03:10 PM
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rjk rjk is offline
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bump

Sorry guys, I have no idea what I did to "Close" the thread but it is open now.

My basic need here is to see if anyone has had a similar problem and where they found the cause.

Which fuses are on the same bus as #13 which seems to be the problem ckt?

Which wire feeds fuse #13?

Can I access anything without pulling the fuse block or is that where I need to start?
__________________
1999 E320 (gave to daughter) 250K
1994 F150 (new engine installed!) 240K
1989 560 SL (Refreshing top end) 150K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (awaiting engine diagnosis) 349K
1986 242Ti (fallow)
1968 GT500KR (under restoration)
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  #3  
Old 01-07-2009, 04:13 PM
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Quote:
Originally Posted by rjk View Post
Sorry guys, I have no idea what I did to "Close" the thread but it is open now.

My basic need here is to see if anyone has had a similar problem and where they found the cause.

Which fuses are on the same bus as #13 which seems to be the problem ckt?

Which wire feeds fuse #13?

Can I access anything without pulling the fuse block or is that where I need to start?
Suggest checking OVP relay. Following circuits are fed by the specified fuse. Hope it helps.


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  #4  
Old 01-10-2009, 01:34 PM
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rjk rjk is offline
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Location: Atlanta metro area
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OK, I have the pass. dash/kick panel disassembled and have a few questions.
Which is the OVP relay?
Is it the tall relay with the attached 10A fuse?
(Fuse is OK, I will disassemble relay to check inside)

Is there a layout diagram somewhere?
(I see many relays, 5 over the fusebox and 2-3 more above the A/C unit)

It looks like I have a dead ckt, 58R.
Voltage is NOT present at fuses #9 or 13 but I see #9 has no identifier so I assume it is a spare.

I did find the fault affecting the pwr. windows so that is now good.

Is there an online downloadable wiring diagram somewhere I can purchase?
__________________
1999 E320 (gave to daughter) 250K
1994 F150 (new engine installed!) 240K
1989 560 SL (Refreshing top end) 150K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (awaiting engine diagnosis) 349K
1986 242Ti (fallow)
1968 GT500KR (under restoration)
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  #5  
Old 01-10-2009, 02:27 PM
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rjk rjk is offline
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Join Date: Oct 2002
Location: Atlanta metro area
Posts: 195
Update

I disassembled the unit I think is the OVP relay (tall w/10A fuse on top, has #126 5404745 stamped on the outside).
There is a power diode inside that shows NO continuity in either direction with my multimeter.
Assuming the meter passes enough current or has enough voltage to overcome the threshold voltage of the diode, I think I found my culprit.
Anyone in disagreement?

Would there be any danger in jumping the diode until I found a replacement?
__________________
1999 E320 (gave to daughter) 250K
1994 F150 (new engine installed!) 240K
1989 560 SL (Refreshing top end) 150K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (awaiting engine diagnosis) 349K
1986 242Ti (fallow)
1968 GT500KR (under restoration)

Last edited by rjk; 01-10-2009 at 03:00 PM. Reason: add ?
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  #6  
Old 01-10-2009, 05:21 PM
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rjk
I sent you an email
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  #7  
Old 01-10-2009, 07:53 PM
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rjk rjk is offline
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Join Date: Oct 2002
Location: Atlanta metro area
Posts: 195
update

All fixed!
Fuse #3 was bad, hairline crack in the element, not noticable to the naked eye but showed up when one side showed hot voltage and the other side zilch.

OVP was weird, is it fed by fuse #3? I cleaned the contacts and everything works as it should now.

Thanks for the help. It pointed me in the right direction.
__________________
1999 E320 (gave to daughter) 250K
1994 F150 (new engine installed!) 240K
1989 560 SL (Refreshing top end) 150K
1986 560 SL (deceased., gave it's life protecting my wife)
1988 300 TE (departed)
1994 945T (awaiting engine diagnosis) 349K
1986 242Ti (fallow)
1968 GT500KR (under restoration)
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