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Steamer Power
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In development — wiring may change before release

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Interrupter wiring

The harness comes built. This page shows where each end goes and what each wire does.

Where each end goes

Power

BATT +

Battery positive (+) post.

  • Red · BATT+

FUSE 10A

10 A fuse in the battery + lead. Keep it near the battery.

  • Red · LOAD
  • Red · BATTERY

BATT -

Battery negative (-) post.

  • Black · BATT-

Coils

COIL 1

GM LS coil 4-pin (Delphi GT150 female)

Plugs onto ignition coil 1 (GM LS-style smart coil, 4-pin).

  • ABlack · POWER GND
  • BBlack, white stripe · SIGNAL GND
  • CWhite · TRIGGER
  • DOrange · +12V

COIL 2

GM LS coil 4-pin (Delphi GT150 female)

Plugs onto ignition coil 2 (second cylinder). GM LS-style smart coil, 4-pin.

  • ABlack · POWER GND
  • BBlack, white stripe · SIGNAL GND
  • CGray · TRIGGER
  • DOrange · +12V

BLOCK GND

Coil grounds. Bolt both rings to the engine block under one bolt, on clean bare metal.

  • Black · COIL 1 GND
  • Black · COIL 2 GND

Sensors

MAP

GM MAP 3-pin (Metri-Pack 150 female)

Plugs onto the GM-style 3-pin MAP sensor.

  • ABrown · GND
  • BTan · SIGNAL
  • CPink · +5V

CHT

GM CLT/IAT 2-pin (Metri-Pack 150 female)

Plugs onto the 2-wire GM-style head temperature sensor. Either way round.

  • 1Yellow · SIGNAL
  • 2Brown · GND

VR PICKUP

Deutsch DT06-2S (sockets)

Plugs into the crank pickup lead (sealed 2-pin plug).

  • 1Violet · VR+
  • 2Violet, white stripe · VR-

Data link

CAN

Deutsch DT06-2S (sockets)

CAN data link (sealed 2-pin plug). Leave it capped if you do not use it.

  • 1Yellow, black stripe · CAN H
  • 2Green, black stripe · CAN L

Open wires

KILL

Bare wire end — you connect it

Kill switch wire. Ground it to stop the engine. Open = run.

  • Blue · KILL

2-STEP

Bare wire end — you connect it

2-step (launch limit) wire. Ground it to turn 2-step on.

  • Green · 2-STEP

NITROUS

Bare wire end — you connect it

Nitrous-on signal. Connect it to a wire that is 12 V or ground when the nitrous is on. Pick which one in the app.

  • Light Blue · NITROUS IN

AUX OUT

Bare wire end — you connect it

AUX output. It switches to ground, for example to drive a relay coil.

  • Purple · AUX OUT

Main plug pinout

Plugs into the Interrupter box. Push it in until the latch clicks.

Main plug pinout, looking into the harness plug (the side that meets the box)1: COIL 1 B+, Orange; 2: COIL 1 TRIG, White; 3: MAP 5V, Pink; 4: VR+, Violet; 5: VR-, Violet, white stripe; 6: MAP SIG, Tan; 7: KILL, Blue; 8: COIL 2 TRIG, Gray; 9: BATT- / SENS GND, Black; 10: BATT+ FUSED, Red; 11: COIL SIG GND, Black, white stripe; 12: CHT, Yellow; 13: NITROUS IN, Light Blue; 14: 2-STEP, Green; 15: AUX OUT, Purple; 16: CAN H, Yellow, black stripe; 17: CAN L, Green, black stripe; 18: COIL 2 B+, Orange123456789101112131415161718
Looking into the harness plug (the side that meets the box). Check the small moulded numbers 1, 9, 10 and 18 on the plug.

Use this table to check each wire with a meter.

Main plug pins: function, wire colour and where each wire goes
PinFunctionWire colourGoes to
1COIL 1 B+OrangeCOIL 1
2COIL 1 TRIGWhiteCOIL 1
3MAP 5VPinkMAP
4VR+VioletVR PICKUP
5VR-Violet, white stripeVR PICKUP
6MAP SIGTanMAP
7KILLBlueKILL
8COIL 2 TRIGGrayCOIL 2
9BATT- / SENS GNDBlackBATT -, MAP, CHT
10BATT+ FUSEDRedFUSE 10A
11COIL SIG GNDBlack, white stripeCOIL 1, COIL 2
12CHTYellowCHT
13NITROUS INLight BlueNITROUS
142-STEPGreen2-STEP
15AUX OUTPurpleAUX OUT
16CAN HYellow, black stripeCAN
17CAN LGreen, black stripeCAN
18COIL 2 B+OrangeCOIL 2

Before you start

  1. 1Disconnect the battery first.
  2. 2Route the harness away from the exhaust and the spark plug leads.
  3. 3Keep the crank pickup lead away from the coil wires.