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Join Date: Apr 2009
Location: Israel
Posts: 352
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Rear wiper doesnt work
Hi All
Well, after the rear hatch adventure is behind me- I have a new problem that need to be solved. The rear wiper doesnt work  When I activate it, I hear a click coming out of the relay but no current is delivered to the rear wiper  There are 2 wires going to the rear wiper: 1 has always 12V the other delivers 12V when activating the rear wiper and this is where the problem is since it doesnt deliver any current. If the relay makes a clicking sound when I activate the rear wiper and the wiper doesnt work, where can be the problem? The rear wiper motor was tested using external current and works fine... any suggestions?
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Porsche 928S 4.7L 1980 European redhead 
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07-10-2009, 10:55 AM
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just because the relay clicks...doesnt mean its good..there are 2 parts to a relay...the actuator side (clicking noise)...and current flow (power to motor)...sounds like the power side is bad
i think Allanaz can explain it better than i can..Allanaz?...your 2cents worth.. 
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John ......... 1978 Porsche 928 5sp LSD 1982 porsche 928 5sp LSD Last edited by american-kiwi; 07-10-2009 at 11:42 AM.. |
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07-10-2009, 11:13 AM
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928-Electrics Guy
Join Date: Jun 2007
Location: Phoenix AZ
Posts: 715
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Indeed just because a relay clicks it doesn't mean its good - or it may be working but have no supply to the contacts (e.g. fuse blown) Check your fuses - there are 2 that affect the rear wiper one for the relay ignition supply (fuse 9 for you) and one for the parking circuit - the permanent supply (fuse 15 for you).
Alan
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1994 928 GTS Black/Black Manual Last edited by Alan in AZ; 07-10-2009 at 11:59 AM.. |
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07-10-2009, 11:56 AM
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Thanks! I will go check it as soon as I can!
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Porsche 928S 4.7L 1980 European redhead
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07-10-2009, 11:54 PM
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Petie3rd
Join Date: Jul 2000
Location: Philly PA
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is the ground wire connected to the motor?
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^^^ Stan ^^^ 2019 BMW K1250 GS 2016 HD RK 1988 S4 Auto , Elfenbein Perlglanz, Pearl Gray 1982 5sp Met black and tan sport seats |
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07-11-2009, 04:55 AM
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Yes. it is connected...
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Porsche 928S 4.7L 1980 European redhead
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07-12-2009, 04:40 AM
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Network Native
Join Date: Jan 2007
Location: SoCal
Posts: 10,349
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Is the ground wire from the motor connected to ground?
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07-12-2009, 08:39 AM
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Yes it is.
If I disconnect the 2 pin connector to the motor and activate it using external power, it works. It means that there is nothing wrong with the ground. Maybe one of the fuses is not good...I havent checked them yet since at first I thought that if I hear a "clicking" sound from the relay - it means that the fuses are ok...
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Porsche 928S 4.7L 1980 European redhead
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07-13-2009, 04:13 AM
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1978 Porsche 928 4.5
