MegaSquirt MS3X Wiring Harness – 8 feet
- 8′ of TXL High temp automotive grade wire.
- Color coded wiring with labeling printed on the wire every 6 inches — no paper tags here!
- All wiring is pre-crimped (NOT solder cupped!) to the DB37
- Heavy duty metal DB37 hood for superior RFI/EMI shielding (no cheap plastic ‘metalized’ hoods used on our harnesses)
- Use with MS3X Expansion board
This is the harness for the MS3X Expansion board. We’ve custom printed these to include all the inputs and outputs on the expansion board. Note that you will still need our regular MSHarness (or relay board/relaycable/wire bundle combination) for the main board DB37 – this is just the MS3X harness. Includes wiring for sequential injection, sequential coil on plug, nitrous, boost control, and more.
| Printed Label | Wire Gauge | Base Color | Stripe Color | |
| 1 | MS3X-1: INJECTOR G | 20ga | White-WHT | Dark blue-BLU |
| 2 | GROUND – no printed label | 20ga | Black-BLK | no stripe |
| 3 | GROUND – no printed label | 20ga | Black-BLK | no stripe |
| 4 | MS3X-4: INJECTOR F | 20ga | White-WHT | Dark green-GRN |
| 5 | MS3X-5: FLEX FUEL INPUT | 20ga | Orange-ORN | no stripe |
| 6 | MS3X-6: BOOST CONTROL | 20ga | Light green-LTGRN | Red-RED |
| 7 | MS3X-7: INJECTOR E | 20ga | White-WHT | Red-RED |
| 8 | GROUND – no printed label | 20ga | Black-BLK | no stripe |
| 9 | MS3X-9: IDLE VALVE | 20ga | Light green-LTGRN | Pink-PNK |
| 10 | MS3X-10: INJECTOR D | 20ga | White-WHT | Pink-PNK |
| 11 | MS3X-11: LAUNCH CTRL IN | 20ga | Gray-GRY | Red-RED |
| 12 | GROUND – no printed label | 20ga | Black-BLK | no stripe |
| 13 | MS3X-13: INJECTOR C | 20ga | White-WHT | Light green-LTGRN |
| 14 | MS3X-14: SPARK A | 20ga | Yellow-YEL | no stripe |
| 15 | MS3X-15: SPARK C | 20ga | Yellow-YEL | Light green-LTGRN |
| 16 | MS3X-16: INJECTOR B | 20ga | White-WHT | Orange-ORN |
| 17 | GROUND – no printed label | 20ga | Black-BLK | no stripe |
| 18 | MS3X-18: SPARK G | 20ga | Yellow-YEL | Dark blue-BLU |
| 19 | MS3X-19: INJECTOR A | 20ga | White-WHT | no stripe |
| 20 | MS3X-20: INJECTOR H | 20ga | White-WHT | Purple-PUR |
| 21 | MS3X-21: SPARE ADC | 20ga | Light blue-LTBLU | no stripe |
| 22 | MS3X-22: EGO2 | 20ga | Light blue-LTBLU | Dark blue-BLU |
| 23 | MS3X-23: EXT_MAP | 20ga | Light blue-LTBLU | Red-RED |
| 24 | MS3X-24: NITROUS OUT 1 | 20ga | Light green-LTGRN | no stripe |
| 25 | MS3X-25: NITROUS OUT 2 | 20ga | Light green-LTGRN | Dark blue-BLU |
| 26 | MS3X-26: TACH OUTPUT | 20ga | Light green-LTGRN | Orange-ORN |
| 27 | MS3X-27: VVT | 20ga | Light green-LTGRN | Dark green-GRN |
| 28 | MS3X-28: TABLESWITCH IN | 20ga | Gray-GRY | Purple-PUR |
| 29 | MS3X-29: NITROUS INPUT | 20ga | Gray-GRY | Dark blue-BLU |
| 30 | MS3X-30: DATALOG INPUT | 20ga | Gray-GRY | no stripe |
| 31 | MS3X-31: PT4 LOGIC OUTPUT | 20ga | Purple-PUR | no stripe |
| 32 | MS3X-32: CAM INPUT | 20ga | Dark green-GRN | no stripe |
| 33 | MS3X-33: SPARK B | 20ga | Yellow-YEL | Orange-ORN |
| 34 | MS3X-34: SPARK D | 20ga | Yellow-YEL | Pink-PNK |
| 35 | MS3X-35: SPARK E | 20ga | Yellow-YEL | Red-RED |
| 36 | MS3X-36: SPARK F | 20ga | Yellow-YEL | Dark green-GRN |
| 37 | MS3X-37: SPARK H | 20ga | Yellow-YEL | Purple-PUR |