Adoom Posted July 10, 2021 Report Share Posted July 10, 2021 I'm installing a link in a 1971 Triumph to run a 1uzfe. The original body wiring loom had a total of 3 fuses and only one relay, for the horn. The headlights had no fuse or relay, that poor little switch.... I have now upgraded it so it has a larger fusebox and some relays to protect the switches: Start signal relay. Goes to starter solenoid. This can be the "Start signal" for the Link too? Live with ignition relay. Indicators, heater, wipers, instruments, radio. headlights high beam relay. headlights low beam relay. Horn relay. I'll have some more relays for the engine: fuel pump relay Ignition Coils relay Engine fan relay So finally on to my question.... Do I need a separate "Main relay" (Like in the "power supplies" section of the Link Help), or can I use the existing "Live with ignition relay" that supplies the indicators/heater/wipers/instruments/radio? Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 11, 2021 Report Share Posted July 11, 2021 ECU power should come from the same supply as the injectors so it knows injector voltage and can appluy the correct deadtime. If you want to use the factory 6 wire stepper motor idle valve then you will need the full "ECU Hold power" circuit as per the help file. This is because the ecu needs to stay powered up for a short time after the ignition is switched off to allow the stepper motor to reset to home position for the next start up. If you have changed to a 2 wire solenoid idle valve then you just need something that supplies power to the ecu and injectors when the ign switch is on. Quote Link to comment Share on other sites More sharing options...
Adoom Posted July 11, 2021 Author Report Share Posted July 11, 2021 10 minutes ago, Adamw said: ECU power should come from the same supply as the injectors so it knows injector voltage and can appluy the correct deadtime. If you have changed to a 2 wire solenoid idle valve then you just need something that supplies power to the ecu and injectors when the ign switch is on. I have indeed changed to a solenoid idle valve. So that sounds like a "Yes". The ECU and injectors can share the same relay as the Indicators, heater, wipers, instruments and radio because it supplies power when the ignition switch is on.... Quote Link to comment Share on other sites More sharing options...
Adamw Posted July 11, 2021 Report Share Posted July 11, 2021 Just make sure it is an ign circuit and not ACC. Radio, wipers and heater are normally connected to ACC which switches off when cranking. Quote Link to comment Share on other sites More sharing options...
Adoom Posted July 11, 2021 Author Report Share Posted July 11, 2021 23 minutes ago, Adamw said: Just make sure it is an ign circuit and not ACC. Radio, wipers and heater are normally connected to ACC which switches off when cranking. Thanks. I hadn't thought of that, I'll go check. Quote Link to comment Share on other sites More sharing options...
Adoom Posted July 11, 2021 Author Report Share Posted July 11, 2021 I checked. It stays on when cranking. I was wrong about the radio being on that circuit. There is a separate ACC wire from the ign switch for the radio. Quote Link to comment Share on other sites More sharing options...
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