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Horn on Implematics

Posted: Tue May 27, 2014 8:03 pm
by odin
Did Implematics come with a horn? Tracing the wires (on my 62 Imp 990) to the dynamo, there is a spare blue wire. The dynamo works, there is power to the lighting cable which runs front to rear. But there is an extra blue cable?

RE: Horn on Implematics

Posted: Tue May 27, 2014 9:22 pm
by Guest
It could be the wire for the horn, a horn and the horn button was an optional extra, it is shown in the wiring diagram but the colour coding of the wiring is not. The horn would be wired with a live feed going to one connection on the button from the ignition key switch, then a wire from the other terminal on the button to the horn positive terminal and then an earth from the horn to the frame, usual place a horn was fitted was on the air cleaner frame up front.

RE: Horn on Implematics

Posted: Tue May 27, 2014 9:22 pm
by JamesF
The horn i think was an optional extra on the implematics. The wire to the horn is purple and black. Blue wire(s) running right to the front on implematic 990s are headlamp wires. The only other blue wire which could be there and runs frontwards is the wire for the temp gauge if fitted. This would be green and blue though not just blue. One of the wires to the dynamo is blue/red. Solid blue wires up front are main beam headlamp wires, these were changed to blue/white wires when the selectamatics came in.

RE: Horn on Implematics

Posted: Tue May 27, 2014 9:44 pm
by Guest
You should see that some wires have a thin coloured line running along them, this is the trace colour, the headlamp wires are, to each, solid blue and blue/red, the second colour is always the trace, always the second colour, the solid blue is the 'main beam' as said and the blue/red is 'dip'. Implematic tractors, with the exception of a few of the very late 990's, were fitted with the capillary type temperature gauge, this was also an optional extra until the electrical gauge was fitted and then it became standard. There was no green/blue wire, just a solid green and this wire ran from the light switch to a double connector and from the connector two solid green wires went one to the number plate lamp on the back of the seat and the other to the small trailer marker light socket.

RE: Horn on Implematics

Posted: Tue May 27, 2014 10:07 pm
by JamesF
There was a green blue wire running from the temp gauge to the sender or the thermo-couple as the book calls it. It's is wire number 20 in the wiring diagram on page 35 of the 850, 880, 990 implematic tractor instruction book.

RE: Horn on Implematics

Posted: Tue May 27, 2014 10:40 pm
by Guest
I have the same instruction book but that wire is not mentioned or included. It may, and probably does, depend on the date the book was printed and weather it relates to earlier or later production tractors, remember that there are 2 series of 990 Implematic and also a separate instruction book for it alone.

RE: Horn on Implematics

Posted: Tue May 27, 2014 11:27 pm
by JamesF
Mine could be a later book showing the wiring for the later 990 but it does show the green/ blue wire from the gauge to the sender. My 990 is a very early one with no temp gauge. I don't think the wiring loom has the green blue wire in it so that wire must have been part of the optional extra temp gauge kit. I had what was left of the blue wires up front , I seem to remember getting a complete harness for the outboard lamps from a later tractor with blue/red and blue/white wires.

Getting back on topic I would say the blue wire would be the main beam headlamp feed.