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Massey Harris & Massey Ferguson Tractors Discussion Forum

12 volt wiring TEA20

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Author  [Modern View]

02-03-2019 06:14:09

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Can someone send me some information and wiring diagram for this tractor. I can't get it to start.i have new plugs,plug wire,distributor cap,points and condenser and coil. Rebuild carburetor, still won't start.

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John Deere D

02-05-2019 11:26:54

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 Re: 12 volt wiring TEA20 in reply to Denteen, 02-03-2019 06:14:09  
With the CHOKE applied,engine cranking is there signs of GASOLINE on spark plugs?
Are spark plugs wet with gasoline?

Dose gasoline run from base of carb, when drain valve is opened?

Remove wire from Resistor to Coil.....check with meter to verify VOLTAGE present at Resistor through Meter grounded to engine block with ignition turned on.

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John Deere D

02-03-2019 16:26:03

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 Re: 12 volt wiring TEA20 in reply to Denteen, 02-03-2019 06:14:09  
Neighbors TEA-20 Factory 6 VOLT converted to 12 Volt:

Remove wire....VOLTAGE supply to Resistor:
Run new wire from Resistor to + post on Battery:
COIL is now HOT.
Try starting Engine and check for spark at each high tension lead with a strobe light / timing light;

If engine starts ...stop engine by removing wire from + post on battery:


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John Deere D

02-03-2019 07:43:48

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 Re: 12 volt wiring TEA20 in reply to Denteen, 02-03-2019 06:14:09  
Is your TEA-20 an ORIGINAL factory 6 VOLT + Earth /Ground converted to 12 VOLT?

Is your TEA-20 an ORIGINAL factory 12 VOLT + Earth/Ground?

Does your TEA-20 have an original GENERATOR..or converted to an Alternator?

Tea 20 original 6 VOLT STATER Engages flywheel on forward side of Flywheel.

TEA 20 original 12 volt Starter Engages Fly Wheel on aft side of Flywheel.

With the Engine cranking / turning over and the choke applied are the spark pugs wet with GASOLINE?

Safety is NUMBER # 1...!

Bob..Owner Operator TEA-20 Ferguson's.

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02-03-2019 16:45:30

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 Re: 12 volt wiring TEA20 in reply to John Deere D, 02-03-2019 07:43:48  
Thanks, did not work. What next?

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02-03-2019 14:18:45

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 Re: 12 volt wiring TEA20 in reply to John Deere D, 02-03-2019 07:43:48  
It's a 12 volt negitive ground switched from 6 volt when I got it. But has not run since I've had it. I think a wire is run wrong. From the key switch to selionode then to resister to coil then to distributor. Sometimes I have spark. Thanks Bob , any idea would help

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