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Discussion and questions related to the course Practical Motorsport Wiring - Club Level
= Resolved threads
I'm wiring up my power relays for an Ecumaster EMU Black installation and was wondering if someone could take a look at my proposed scheme, please? I am using a solid state relay block made by MSD (link). It provides 4 x 20A relays and is a bit different to conventional relays in the way the relays are all permanently powered (by a single power feed directly from the battery). You then get to trigger each relay by providing either a high or low side signal. I have grouped the four relays as follows (pic attached):
Relay 1 = ECU Power
Trigger = High side (ign-switched +12v)
This powers the ign-switched input (G18) on the EMU Black, as well as my dash and wideband sensor. The EMU Black will get its B13 constant power feed from elsewhere.
Relay 2 = Coils & Injectors
Trigger = High side (ign-switched +12v)
This powers the (dumb) ignition coils and injectors
Relay 3 = Fuel Pump
Trigger = Low side (EMU Black AUX output)
This powers the fuel pump
Relay 4 = Rad Fan
Trigger = Low side (EMU Black AUX output)
This powers the rad fan
Are there any issues with this configuration? My only doubt concerns the separate triggering of relays 1 and 2 with ignition-switched power. Would it be better to use the Main Relay Output of the EMU Black to trigger Relay 2 (coils and injectors) instead?
