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Post by marsbar350 on Sept 2, 2014 22:15:21 GMT 1
hi guys been rebuilding a 250lc.i cant get the temp gauge working it did work.would go right to the red and back down again.then not work  is the gauge goosed.ive tried 2 senders same outcome  is there a fix for the gauge  or am i looking at getting another |
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Post by shane250 on Sept 3, 2014 20:56:37 GMT 1
Its been a while but i think i had some guage issues and i think it turned out to be in the clock wiring.Is all the blocks connected and right.Could be talking bollox tho....
If the guage did work id gamble on saying it isnt that.
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Post by billbott on Sept 3, 2014 22:18:43 GMT 1
Switch on the ignition then earth the temp sender wire - it will send the temp gauge to the red if the gauge is ok.
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Post by marsbar350 on Sept 5, 2014 14:54:32 GMT 1
Switch on the ignition then earth the temp sender wire - it will send the temp gauge to the red if the gauge is ok. hi bill did what you said and earthed the sender wire and gauge moved to the red so where will be the fault  |
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Post by shane250 on Sept 5, 2014 16:42:40 GMT 1
in the sender
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Post by marsbar350 on Sept 5, 2014 17:57:11 GMT 1
tried another thats the same bollocks  |
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Post by billbott on Sept 5, 2014 18:15:04 GMT 1
It was the sender with mine Andy.
Is the second sender ok?
There's a recent post that tells which one fits, it's off some land rover.
Did mine a few weeks back mate.
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Post by yamark on Sept 5, 2014 18:21:37 GMT 1
Marsbar, to clarify - the temp gauge has a permanent live to it. It reads by earthing through the sender unit. The sender is a wax rheostat that alters resistance to earth If you earth the sender wire and the gauge works you then know the gauge and wiring is OK As Shane says it has to be the sender [likely] or the sender not making contact with the head properly [not so likely]
HTH regards Mark
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Post by kostas on Sept 5, 2014 20:12:35 GMT 1
Where does the engine gets its earth from??
Is there a wire that is supposed to do that or it just gets its ground from exhausts, cables etc...
Kostas
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Post by marsbar350 on Sept 5, 2014 20:14:15 GMT 1
Where does the engine gets its earth from?? Is there a wire that is supposed to do that or it just gets its ground from exhausts, cables etc... Kostas fook knows kostas its a black art wiring  |
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Post by elsie1411 on Sept 5, 2014 21:49:31 GMT 1
did you put any sealer on the threads of the sender unit when you screwed it into the head? also check that the connection that goes on to the sender is still crimped on the cable
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Post by steven on Sept 5, 2014 21:50:47 GMT 1
Where does the engine gets its earth from?? Is there a wire that is supposed to do that or it just gets its ground from exhausts, cables etc... Kostas fook knows kostas its a black art wiring Hi, The black wire that comes from the neg side of the battery is connected to, amoungst other things, the eyelet on the black wire that gets connected to one of the the ignition coil mounting bolts, so that puts negative to the frame. If you look on the back of the alternator stator plate, there is a small metal clip that holds the wires coming out of the alternator, if you look closely, the screw that holds this metal clip onto the stator plate has a black wire connected to it too. On The plug from the alternator with the Black, Red and Brown wire, the black wire is the wire that is connected to this metal clip on the rear of the alternator stator, when this plug is connected up, it sends the earth to the CDI unit. I didnt know this off the top of my head, I have just looked at the wiring diagram in the Haynes manual and looked at a spare alternator. Hopefuly one of our electrical ghurus can tell me if im talking out my arse or not steven. |
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Post by shane250 on Sept 5, 2014 21:56:57 GMT 1
tried another thats the same bollocks if you touch the wire on the nut part of the sender with it in situ and the guage goes up,then it is the sender,nothing else. |
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Post by marsbar350 on Sept 5, 2014 22:17:05 GMT 1
will try that now shane 2 bottles of red tippled |
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Post by marsbar350 on Sept 5, 2014 22:23:38 GMT 1
will try that now shane 2 bottles of red tippled ?? gauge didnt move |
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Post by steve h on Sept 5, 2014 22:30:40 GMT 1
will try that now shane 2 bottles of red tippled ?? gauge didnt move Try white lightning, gauges don't like red wine. |
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Post by shane250 on Sept 6, 2014 9:14:19 GMT 1
Switch on the ignition then earth the temp sender wire - it will send the temp gauge to the red if the gauge is ok. hi bill did what you said and earthed the sender wire and gauge moved to the red so where will be the fault where did you earth it to? |
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Post by shane250 on Sept 6, 2014 9:14:55 GMT 1
will try that now shane 2 bottles of red tippled ?? gauge didnt move Then either the sender or the engine isnt earthing. |
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Post by midlifecrisisrd on Sept 6, 2014 18:06:38 GMT 1
If the neutral light works then the engine is earthed as it should work the same way.
Steve
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Post by marsbar350 on Sept 8, 2014 9:49:57 GMT 1
neutral light works
earthed for the test on a headbolt
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Post by ngordoncrosby on Sept 8, 2014 9:58:56 GMT 1
maybe have some more wine
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Post by yamark on Sept 8, 2014 11:27:03 GMT 1
Marsbar, to clarify - the temp gauge has a permanent live to it. It reads by earthing through the sender unit. The sender is a wax rheostat that alters resistance to earth If you earth the sender wire and the gauge works you then know the gauge and wiring is OK As Shane says it has to be the sender [likely] or the sender not making contact with the head properly [not so likely]
HTH regards Mark
Right, am I correct- Gauge reads if you touch sender wire to a head bolt. Gauge doesn't read if you touch sender wire to the brass body of the sender unit. If so, it has to be the sender unit or the thread of the sender is making poor contact with the head. To check if it's the contact, connect the sender wire to sender, twist some spare wire round the sender body and earth the other end to a head bolt or negative of the battery. You will have to start the bike and get it to temperature. If the gauge reads the sender has a poor contact or your cylinder head isn't making a good contact through the head bolts [is the head painted under the washers?] IT HAS TO BE ONE THESE FAULTS.
Or just buy a case of wine
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