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Harry Ferguson Tractors Discussion Forum
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eletrical problems on TE-A20

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dutchfarmer

04-25-2005 13:32:32




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I have a tea 20, I think its a '52 and it hasn't been running for 10 or so years it was missing alot of wires or had them cut so I put all new wires everywhere acording to the diagram I got from somebody here...and I am having some problems, when I turn the key to on, once and a while the generator will try to turn the engine over, but it can't so it just will whine, also I can't get a spark, could this be because of a bad coil? how do i check that?

thanks in advance

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John(UK)

04-26-2005 08:03:10




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 Re: eletrical problems on TE-A20 in reply to dutchfarmer, 04-25-2005 13:32:32  
If the generator is being powered from the battery and trying to turn then the control box is either stuck or the wiring is wrong somewhere. Check wiring and make sure that the control box is not stuck shut on the points.if you need more help, email me at:- fergusontractors at tiscali dot co dot uk
and tell me what the problem is and what the tractor is too.



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Daniel45

04-25-2005 16:01:58




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 Re: eletrical problems on TE-A20 in reply to dutchfarmer, 04-25-2005 13:32:32  
Starter Motor whine - either bad cable connection from battery / starter relay / etc. Or it is the inertia mechanism- (a spring loaded gear is pushed out by the rotating motor to engage with flywheel ring gear) - take off starter motor and lightly oil the drive shaft and inspect flywheel ring gear for missing teeth (Parts still available).
No Spark - using multimeter or a test lamp, disconnect wire at coil (from key switch to coil side), with key ON the lamp should light when connected between this wire and the Earth (either Battery terminal or engine block), now reconnect the wire if OK. Disconnect coil to distributer wire at distributer end and repeat, lamp should light. Coil fault if it does not.
If OK disconnect large high tension lead (coil to distributer)from distributer cap end and touch to spark plug top, now connect small wire end to earth and rapidly disconnect it. When rapidly disconnected it should cause a spark from the coil. Reconnect all wires.
Inspect distributer cap for cracks, burnt contacts, tracks (arc ing along cap)etc,
Check points for burning, corrosion etc and that they open and close properly, if burnt then you will need a new condensor as well as new points. Timing - Connect a test lamp between thin wire from coil and disributer contact, light should be on if points are closed, off when points are open, Rotate engine until no 1 cylinder is at approx. TDC on the compression stroke, Insert a drill bit into small hole on front of engine/bell housing face, bit should enter hole in flywheel and lock flywheel at the correct timing point. (Be careful you do not snap drill bit if engine is turned), Now slacken clamp on distributer body and rotate distributer body until the lamp just goes out. Engine now correctly timed.
Remove drill bit and reconnect all wires etc and try to start, if still no sparks remove High Tension lead at distributer cap (From Coil) and place close to good earth, and start, if spark produced then replace distributer cap, or rotor, or high tension leads to spark plugs, if no spark check points and condensor again.

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John(UK)

04-26-2005 07:58:30




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 Re: eletrical problems on TE-A20 in reply to Daniel45, 04-25-2005 16:01:58  
Sorry but it depends on the distributor that is fitted to the engine as to whether it is timed correctly, not all the engines are the same.On early engines the timing hole in the flywheel was at a different point to the later ones. Need to know the number from the distributor plate (riveted on the side) and the engine number (between the coil and the distributor, stamped in the cylinder block)



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