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Understanding the wiring on the Ktuned Race Chassis Harness

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952 views 2 replies 3 participants last post by  captain awesome  
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#1 ·
I’m currently working on putting a K20A2 into my ‘88 Bertone X1/9. I’m running a Link G4X Plugin Ecu, Ktuned Engine Harness, and a Ktuned Race Chassis Harness.
my current issue is wiring in chassis harness. I understand the 12V Constant(fused) wire. The Fuel Pump wire and Signal from Start Relay wire are the ones giving me an issue.
In Ktuned website they say “Fuel Pump - Ground Output - Green/Yellow” now does this mean it gets wired directly to the ground of the fuel pump. If so where would I run the positive on the fuel pump to, just a constant 12V or a Switched 12V?
Then there is the “Signal From Starter Relay” does this run to the starter at all or just to the ecu to tell it that the car has started?
 
#2 ·

gives you a good idea on how this is done.
The ignition lock puts out 12V that gets fed to the ECU.
ECU sees this and activates the main relay. Main relay coil is on permanent 12V and gets grounded by the ECU to activate it.
The main relay output is called switched 12V. This powers everything in regards to engine. Its 12V feed feeds injectors, coils, ECU etc. and the fuel pump.
12V main relay output goes to fuel pump relay and from there to the fuel pump. The other wire of the FP is permanently grounded.
Or do it the other round. Provide main relay 12V feed directly (with FP fuse) to fuel pump and have the fuel pump relay switch the FP's ground line to actually ground.

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