Triumph Stag Elec-trickery
Updated by Tim Buja
This information may be of help to you in sorting out electrical matters that you may have concerning your Stag. This information was compiled from the Stag Repair Operations Manual electrical drawings and by exploration in my 1973 Mk II Stag (USA market with air conditioning). Remember that there are always discrepancies between the ideal and real worlds... Good Luck!
Quick Index
Stag Fuses and Associated Equipment
Fuse Size Fed Wire Service
# amps from color
1-2 35 Battery P "Battery Control"
Horn & horn relay, lighter, puddle lamps, roof (T-Bar) lamp,
console lamps, glovebox lamp, clock, main beam flash, hazard
flashers, boot lamp
3-4 35 Ignition G "Ignition Control"
Switch Fuel gauge, temperature gauge, tach, stop lamps, windscreen
"Ign on" washer pump, reverse lamps, turn signals, seat belt buzzer
5-6 5 Master RB "Parking Lights"
Lighting LH tail lamp, LH front parking lamp
Switch
7-8 10 Master R "Side & Tail Lights"
Lighting RH tail lamp, instrument lights, marker lamps, license plate
Switch lamps, automatic transmission shifter lamp, lighter lamp
9-10 ?? Ignition PG "- Unlabeled -"
Controlled Heated rear screen, A/C compressor clutch,
Relay A/C condensor fans
11-12 25 Main/Dip/ US "Headlights Main Beam "1""
Flash Switch LH Main Beams
13-14 25 Main/Dip/ UW "Headlights Main Beam "2""
Flash Switch RH Main Beams
15-16 10 Main/Dip/ UR "Headlights Dip Beam RH"
Flash Switch RH Dip Beam
17-18 10 Main/Dip/ UK "Headlights Dip Beam LH"
Flash Switch LH Dip Beam
19-20 15 Ignition G "Screen Wiper Motor"
Switch "on" Windscreen wiper motor, wiper delay relay
21-22 25 Ignition PU "Heater Motor"
Controlled A/C microswitch, blower motors, A/C relay,
Relay blower speed change relay
23-24 10 Window Lift Y "Overdrive"
Relay Overdrive
Wire Colors and Functions
B Black G Green K Pink LG Light Green N Brown O Orange
P Purple R Red S Slate U Blue W White Y Yellow
B Ground
G Ignition Aux--from fuse 3-4 or 19-20
N Battery - unfused
P Battery Control - from fuse 1-2
R RH park/tail/side, license plate lights
S Window lift relay to window lift CB & overdrive circuit fuse 23-24
U Headlight feed to main/dip/flash switch
W Ignition Switch "Ign on"
Y Fuse 23-24 to overdrive switch
BP Brake differential pressure (PDWA) switch to brake warning light
BG Key buzzer to ignition key contact
BW Handbrake switch to handbrake warning light
GB Fuel sender to gauge
GLG Gearbox/seat belt switch to LH belt switch & RH seat switch
GN Reverse light switch to lights
GO Low fuel sender to low fuel warning light
GP Brake light switch to lights
GR LH turn signal
GS A/C cars: Blower switch to blower speed change relay - energized for low speed
Heater cars: Blower switch "high speed" feed to blower motor
GU Temp sender to gauge
GW RH turn signal
GY A/C cars: Blower motors to blower switch
Heater cars: Blower switch "low speed" feed to low speed resistor
KW Ballast resistor wire to ignition coil
LGB Washer pump from steering column switch
LGK Hazard flasher unit to hazard switch
LGN Turn flasher unit to steering column switch & hazard switch
LGO LH belt switch & RH belt switch to Fasten Belt light, to key buzzer thru a diode
LGS Hazard switch to turn flasher
NLG Wiper park switch, delay relay circuit
NR Ignition switch "off" to vent valve solenoid
NY Ignition warning light to alternator field
PB Horn switch to relay
PK A/C relay to heated rear screen switch
PLG A/C microswitch to A/C relay & blower switch (starts blowers on low speed)
PN Ignition controlled relay to fuses 9-10 & 21-22
PO Interior light switch to RH console and roof lamps
PR RH door pin switch to RH puddle lamp & interior light switch
PS LH door pin switch to LH puddle lamp & interior light switch, to key buzzer thru a diode
PU Blower motor & A/C relay circuit feed from fuse 21-22
PW Interior light switch to LH console & roof lamps, boot lamp circuit, glovebox lamp circuit
PY Horn relay to horns
RB Fuse 5-6 to LH front park lamp, LH tail lamp
RG LH parking lamp supply from master light switch, to ign switch to feed RH lamps w/ ign on
RLG Wiper normal speed
RO Fuse 7-8 to RH tail lamp, RH front park lamp, instrument lights, front marker lamps
RW Dash panel lights from rheostat
RY Front fog light feed from master light switch
SB A/C relay to condenser fans & high pressure cutout switch
SG Window lift CB to window lift switches, RH window lift switch to RH window lift motor
SN LH window lift switch to LH window lift motor
SO A/C high pressure cutout switch to A/C compressor clutch
SP RH window lift switch to RH window lift motor
SU LH window lift switch to LH window lift motor
SW RH blower motor to blower motor speed change relay
SY A/C relay to thermostat
UK LH dip beam
ULG Wiper high speed
UR Main/Dip/Flash switch to fuse 15-16 & 17-18, fuse 15-16 to RH dip beam
US LH main beams
UW Main/Dip/Flash to fuse 11-12 & 13-14, main beam warning lamp, fuse 13-14 to RH main beams
WG Heated rear screen switch to heated rear screen & warning lamp
WK Ignition Switch "Acc" - radio feed
WLG Wiper delay circuit
WN Oil pressure sender to light
WP Vent valve solenoid to oil pressure switch
WR Ignition Switch "Start" through auto trans inhibit switch to starter solenoid
WS Tach signal from ignition coil negative terminal
WU Choke cable switch to choke warning light
WY Starter solenoid to ignition coil--supplies full voltage to coil while cranking
YP Overdrive switch through overdrive gearbox switch to overdrive solenoid
B Black G Green K Pink LG Light Green N Brown O Orange
P Purple R Red S Slate U Blue W White Y Yellow
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