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sensor ground and splices

EFI Wiring Fundamentals

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Discussion and questions related to the course Motorsport Wiring Fundamentals

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Im lost on how to wire the sensor ground of 5V source to multiple sensors. I understand that they sensors can share this common connections, but how to figure out my wiring needs as far as the splice. For example, lets say I'm wiring up 4 sensors on one common ground, how do I calculate the wire size for the 4-1 splice or vice versa for 5V reference?

Because the 5v reference is going to sensors which draw minimal/no current wire size isn't hugely important. Poor connections causing voltage drop is the bigger issue.

Generally if I have one 5v wire (say 20-22g in size) coming out of an ECU, I will use a crimp joint and splice this out to the required amount of wires I need. Generally the same size (20-22g).

I will also do the same with sensor grounds/ground out form the ecu. In these cases I am also against solder joiner the wires as this can cause issues later in life with poor connections and voltage drop.

I will also use the same size ground wires as I do 5V

So I'm wondering now how do you all do your ground for the coils with a concentric twist? Do you ground all the way at to the bulk head connector then to engine ground? Or straight from cool to engine ground?

We usually reply within 12hrs (often sooner)

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