Need used AC Relay 928 618 105 00 please
09-12-2010, 01:52 PM
#31
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I have bypassed mine with a 53 relay and a switch with this diagram. I have been trying to reverse engineer the circuit from the original relay that uses RPM signal to shut off the compressor but no luck thus far. I have a bad relay that I will send Roger to work with as well. This is too common a failure point to not come up with a practical solution.
08-21-2022, 03:39 PM
#32
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Resurrecting this ancient thread as I just encountered this same issue on my 80 Euro S. I jumpered 30 and 87 for now but would like to find a more suitable solution
Funny thing is that the original relay chart from the german owners manual doesn't even show this relay for 80 928s. Seems my CE is part 1980 and part 1979. An added excitement factor when working on this car.
Funny thing is that the original relay chart from the german owners manual doesn't even show this relay for 80 928s. Seems my CE is part 1980 and part 1979. An added excitement factor when working on this car.
08-21-2022, 09:52 PM
#33
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USA 80's certainly do not have this special tachymetric relay.
Disabling while cranking is rather easy to do - so I'd suspect it might be set to drop out at idle speeds as well as cranking speeds - its easier to disable a relay just during cranking using the (50) starter circuit as a coil ground - so this would seem hugely overengineered just for that.
Anyway if that is the correct behavior use a standard relay with its 86 connected to (15) and its 85 terminal connected to (50) - (30 & 87 as the current layout) it will turn off during cranking. It requires some CE surgery - but afterwards a standard Bosch SPST or SPST relay will work for any replacement... Your car is already non-standard it seems.
Alan
Disabling while cranking is rather easy to do - so I'd suspect it might be set to drop out at idle speeds as well as cranking speeds - its easier to disable a relay just during cranking using the (50) starter circuit as a coil ground - so this would seem hugely overengineered just for that.
Anyway if that is the correct behavior use a standard relay with its 86 connected to (15) and its 85 terminal connected to (50) - (30 & 87 as the current layout) it will turn off during cranking. It requires some CE surgery - but afterwards a standard Bosch SPST or SPST relay will work for any replacement... Your car is already non-standard it seems.
Alan
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Oldewoodupes (09-03-2023)
08-21-2022, 10:11 PM
#34
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USA 80's certainly do not have this special tachymetric relay.
Disabling while cranking is rather easy to do - so I'd suspect it might be set to drop out at idle speeds as well as cranking speeds - its easier to disable a relay just during cranking using the (50) starter circuit as a coil ground - so this would seem hugely overengineered just for that.
Anyway if that is the correct behavior use a standard relay with its 86 connected to (15) and its 85 terminal connected to (50) - (30 & 87 as the current layout) it will turn off during cranking. It requires some CE surgery - but afterwards a standard Bosch SPST or SPST relay will work for any replacement... Your car is already non-standard it seems.
Alan
Disabling while cranking is rather easy to do - so I'd suspect it might be set to drop out at idle speeds as well as cranking speeds - its easier to disable a relay just during cranking using the (50) starter circuit as a coil ground - so this would seem hugely overengineered just for that.
Anyway if that is the correct behavior use a standard relay with its 86 connected to (15) and its 85 terminal connected to (50) - (30 & 87 as the current layout) it will turn off during cranking. It requires some CE surgery - but afterwards a standard Bosch SPST or SPST relay will work for any replacement... Your car is already non-standard it seems.
Alan
This is a one owner car prior to me and the relay was dated 10-79. Its the 135th S built and was made for the Swiss market. I have some conflcting research on this relay. Some have stated that all CIS cars should have it while I have seen other posts that say it ended with the manual climate in 79. My CE panel is MOSTLY conforming to the 80 diagram with the exception as this relay and a couple of fuse positions that that are swapped around and mimic the 79 configuration
08-21-2022, 10:31 PM
#35
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This is a one owner car prior to me and the relay was dated 10-79. Its the 135th S built and was made for the Swiss market. I have some conflcting research on this relay. Some have stated that all CIS cars should have it while I have seen other posts that say it ended with the manual climate in 79.
