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Post by Deleted on Jan 19, 2009 23:10:45 GMT
I'm trying to figure out why my oil gauge occasionally works but most of the time doesn't read at all. The connections to the transmitter on the pump seem to be O.K. It reads full voltage on both sides of the of the gauge when engines running, but no pressure reading. I was wondering if it's the gauge or the transmitters that's faulty, and how to test them. Any help appreciated, Oliver.
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Post by eisdielenbiker on Jan 20, 2009 15:53:23 GMT
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Post by johnwp5bcoupe on Jan 20, 2009 19:04:16 GMT
I'm trying to figure out why my oil gauge occasionally works but most of the time doesn't read at all. The connections to the transmitter on the pump seem to be O.K. It reads full voltage on both sides of the of the gauge when engines running, but no pressure reading. I was wondering if it's the gauge or the transmitters that's faulty, and how to test them. Any help appreciated, Oliver. I assume you mean 10v on the supply side oliver if you have the same on the other side you have lost the earth return via the sender if this is the same static and running are there volts on the sender under both conditions?
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Post by Deleted on Jan 21, 2009 15:21:55 GMT
Thanks for replies. I've re-checked wiring :- there's about 12.5v each side of gauge with ignition on and about 14.5v engine running, almost the same reading goes with the sender. And it doesn't seem to change with high or low revs. However, my wiring loom only has the one wire from the gauge to the sender. I assumed it was earthed through the body. I connected a wire from the other terminal on the sender to earth and obviously blew the fuse. Should the sender have live on both terminals? Still confused, Oliver
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Post by johnwp5bcoupe on Jan 21, 2009 19:56:36 GMT
oliver I checked the diagram and it is a 12v feed from the 12v side of the regulator sorry for the duff info if you have 12v under all conditions ie with oil pressure you should have less than 12v on the sender side if there is no reading try briefly shorting out the sender to earth you should get a full scale reading
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Post by Deleted on Jan 23, 2009 17:00:51 GMT
I tried connecting the sender to earth and this time it didn't blow the fuse and the gauge read way over maximum. I guess this means the gauge is O.K., and the senders at fault - when it did work it would always read very high with almost no variation when hot etc. So now it's time to find a new sender. I still can't figure out why my wiring has only got one lead to the sender, although there's two terminals on the sender. Thanks, Oliver
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Post by Phil Nottingham on Jan 23, 2009 17:11:39 GMT
Senders may have a double male Lucar and sometimes a separate earth one or for the electric pump cut-off/oil pressure failure warning. If it is not the former one its not a P5B sender which NLA anyway. Secondhand ones are unlikely to be any better and certainly not accurate even when new
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Post by johnwp5bcoupe on Jan 23, 2009 18:15:34 GMT
I tried connecting the sender to earth and this time it didn't blow the fuse and the gauge read way over maximum. I guess this means the gauge is O.K., and the senders at fault - when it did work it would always read very high with almost no variation when hot etc. So now it's time to find a new sender. I still can't figure out why my wiring has only got one lead to the sender, although there's two terminals on the sender. Thanks, Oliver Well at least you know what the problem is oliver
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