Trike Electrics

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Hazard Switch
Speedo & Tacho

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There is a whole lot of information that you will need to know about the electrics of the HS3 trike.  For now, we have started with the basics:

There will be more added in the future.

HS3 Trike Relays and Fuse box


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You will find the fuse box under the vinyl cover right behind the handbrake. The relays are positioned behind the fuse box towards the rear of the trike and pull out towards the top of the trike. Try to remember how they came out to make it easier to put them back in. The relays for Starter, High beam and Low beam are the same. If you need to check if a relay is working ok just swap them over. The last relay in line is for the blinkers and is different to the other 3.

The two bottom sockets in the fuse box are spares and can be used to store spare fuses or for something like a 12 volt socket or the auxiliary wire on the tow bar. To make life a bit easier we have included a guide to the connections, wire colours and fuse sizes on the relays and fuse-box.

On a rainy day with nothing on TV it pays to pull apart the plugs, relays and fuses and spray the lot with contact spray. Once per year is good enough or before the big trip. It is a good Idea to keep water away from all electrical bits and pieces, but don't try to make things water proof with plastic bags, tape or silicone. If you seal it up and water does get in then it can't dry out and corrosion will set in much faster.

Anybody can replace a fuse and wiggle a relay, but it would be smart to find out why a fuse blew up or a relay died. That's where the professionals should come in. Or do what I do and get stuck in pooring rain in the dark half way between Sydney and Brisbane without the old toolbag or spares.

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Trailer-plug connection colours

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Trailer-plug function
Right hand blinker Green Green/black
Left hand blinker Yellow  Grey/black
Tail-light  Brown  Grey
Stop-light Red  Green
Earth connection  White  Brown
  • A 12 volt test light would be handy to make sure all the connections work before you refit the body.

The best 12 Volt socket I have found is a 7 pin flat; very small and well designed and the plug doesn't fall out what ever you do. If you are going to fit a Towbar later, just install the socket and zip-tie it somewhere at the rear so you can find it when fitting the Tow-bar.

You could also run a wire from the fuse-block to the No 5 contact on the socket in case you need a light or 12V plug in your Trailer later. Never run a wire straight from the battery without a fuse. On the HS3 you will find 2 spare fuse-holders at the bottom of the fuse block, run your wire from there and make it a red one so the next person who works on your Trike knows that this is a positive wire.

Wiring Functions and Colours HS3
(2seater and 3 seater)

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Wire Colour
Wire Type
Gray 0.75 Instrument lights
Black 0.75 Oil-pressure switch
Blue 0.75 Battery charge 
Yellow 0.75 Low Beam
White 0.75 High Beam
Green 0.75 Stop-lights
Black/White 0.75 Indicator Left
Black/Green 0.75 Indicator Right
Braun/White 0.75 Reversing-light
Red/Blue 0.75 Hazard-light switch Indicator Relays
Black/Green 0.75 Tacho
Yellow/Green 0.75 Break fluid control switch / Warning-light
Red/Yellow 0.75 Fuel sender-unit / Gauge
Gray/Green 0.75 Break fluid control switch / Warning-light
Red/Black 0.75 Fuel sender-unit / Gauge
Brown 0.75 Earth/ Negative -
Red 1.50 Positive +
Black 1.50 Ignition to Coil, Brake fluid control switch, Reversing switch, Stoplight-switch and Oil-pressure switch
Purple 1.50 Positive +
White/Red 1.50 Battery positive Relays High Beam
Purple/Black 1.50 Battery positive Relays Starter
Green/Red 1.50 Battery positive Relays Low Beam
Red 2.50 Battery positive +
Black 2.50 Positive to Magnet Switch Starter

Note: If you add any wires to your trike for alarms, stereos, extra lights, beer-fridges, etc make sure you use different colours to make it easier for the electrician to find his way. A note in your handbook helps too in time to come. If you run positive or negative wires stick to red and brown. 

Black should be used as a positive wire after the ignition switch. That could save you a lot of money and time down the track.

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