COMPONENT ORIENTATION CORRECT WHEN TRACTOR IS VIEWED FROM ABOVE FROM LEFT (DISTRIBUTOR) SIDE OF TRACTOR
GENERATOR LUCAS 22703H 12V D E A F Relay LUCAS Model RB108 CHARGE INDICATOR 12 V INCANDESCENT
FUSE 17A SUPPLY TO LIGHTS SWITCH IGNITION KEY SWITCH ON / OFF
START SWITCH (momentary) activated by gear-stick 1 OP 3

SUPPLY

GROUND STRAP TO LIGHTS
Chassis ground to switch mount nut LUCAS COIL 12V STARTER MOTOR LUCAS 25079J
DISTRIBUTOR Firing seq 1-3-4-2 (Cylinder #1 at front of motor)

BATTERY 80Ah 12V

Wiring diagram for FERGUSON TEA20 TRACTOR Serial # TEA477296 (1955) Petrol 4 cylinder (Standard engine) 12v Positive earth system
2004 Adrian Redmond / ferguson@channel6.dk
POSITIVE EARTH Grounded to chassis at oil filler casting
Note Auxiliary equipment such as headlights, taillights, reversing/work-lamp, horn etc. are not shown, but would be wired as for negative earth, between chassis/battery +ve terminal (earth) and either starter switch -ve input (independent of ignition key), or via a relay fed from starter switch -ve terminal but switched via output of ignition key switch (dependent on ignition switch).

RIGHT HEADLIGHT HIGH

COMMON

DIP BEAM

(red) (green) (yellow) COMMON HIGH BEAM
Original Lucas lights selector allows for separate selection of front side/parking lights (pos 1), dipped headlights (pos 2) and main beam (pos 3) whilst powering rear side/parking lights in all 3 positions. To accomplish this, supply must be as indicated with rear side/parking lights fed from switch wiper. Check or replace switch spring to ensure good contact.

SWITCH

REAR RIGHT WORKLAMP

DIP COMMON

H4 LAMP SEEN FROM REAR

PARKING

TAIL RIGHT

(blue)

FERGUSON LIGHT SWITCH (rear view) 7 WIRE CABLE ON LEFT SIDE OF MOTOR OFF WIRE CABLE ON RIGHT SIDE OF GEARBOX

(Black - SPARE)

CABLE LOOM SPLITS AT INSIDE TOP OF GRILLE (Common doubled) LEFT HEADLIGHT HIGH
JUNCTION BOX UNDER LIFT CONTROL ARM
Black and White wires spare but fed to each tail Yellow and Red spare and unused

(brown) (green)

(white)

(black) HORN

LIGHTS COMMON GROUND
FUSE 17A HORN PUSH SWITCH (Momentary)
(Black - SPARE) (Brown - SPARE) TAIL LEFT
Wiring diagram for lights & horn FERGUSON TEA20 TRACTOR Serial # TEA477296 (1955) Petrol 4 cylinder (Standard engine) 12v Positive earth system
GROUND STRAP TO STARTER SWITCH MOUNT BOLT
SUPPLY 12V -ve FROM IGNITION KEY
Original TEA horn button has one terminal which is shorted to switch chassis and ground when pressed, therefore to use this button the horn must be permanently fed with 12v and grounded via the switch. Remember that the tractor is positive ground! For modern single pole button with isolated terminals feed live to one horn terminal via switch and ground the other horn terminal.