88jdmfc

I have 2 questions but 1st Ive finished the zeal board conversion on my ms2 v3.57 and made the 4 conductor shielded wire needed to run 2nd VR sensor now i need to know where to plug the pins into according to aaroncakes writeup it says to wire them into holes 3 and 4 but on my MS harness they are already used for spare pin wires and just wondering where i should plug them into instead the pins that are free with no wires are 8-14?

2nd question deals the the purple wire that needs to be run to the fuel pump relay and just need to know exactly which wire on the relay i need to wire it into there is 5 wires need to know if its FP, FC, B, STA, or E?

driftxsequence

iTrader: (8)

I have the same issue with your first question. I actually snipped wires 3/4 and soldered to them. I am not sure how the MS will read the signal though. Maybe someone can verify that.

If you view Aaron's mast sheet it should show the #s on the relay in which you connect to. If you do not have the numbers, you may be able to find something on the web that translates the letters to the numbers that are normally in their place.

Aaron Cake

iTrader: (1)

I'm a bit confused as to what you are asking. Are you saying you have wires already on the spare pins? That's the updated DIY Auto Tune harness. Either remove the pin that has the existing wire on it (there is a little tool for this that you can purchase at most electronics stores) or just cut the wire about 1/2" from the connector, strip, solder your wire on and insulate with heat shrink.

On my master schematic the terminals on the relay are clearly marked.



Almost all automotive relays share a standard pinout. Use a generic relay from the parts store, not the stock fuel pump relay.

88jdmfc

yea i have the updated harness and ok just remove pins and place in there spots thnx

and as for the fuel pump i get it just order a plan generic one and wire it in at 85 right..ok thanks aaron that should be all i need to finish my MS thnx

Aaron Cake

iTrader: (1)

As you can see in the schematic I posted, the Megasquirt is connected to terminal 85 of the relay (or 86) and 86 (or 85) is connected to 12V.