FastKat

iTrader: (10)

On many conversions, when you put the key in the run position, a bunch of stuff gets power - the ECM, TAC module, DBW throttle body, coils, injectors, O2 sensors, etc. This is usually done using relays rather than taking the power straight through the ignition switch. How many circuits and relays do you use to power all of that stuff? Do you guys run that all off of one 30A mini relay, or do you use multiple or larger relays?

I was thinking about something like this:

30A relay #1:
(1) 15A fused circuit for PCM, IAT, MAF
(1) 15A fused circuit for ETC throttle body & TAC module

30A relay #2:
(1) 15A fused circuit for odd coils and injectors
(1) 15A fused circuit for even coils and injectors

30A relay #3
(1) 15A fused circuit for oxygen sensors
(1) 5A fused circuit for miscellaneous stuff (aftermarket alarm, TCC/cruise relay, etc)

Is 3 relays overkill? Do you guys usually condense these into fewer relays? I tried copying what the OEM wiring diagrams called for, but it's not a perfect copy because I discarded a lot components that I didn't want.

i r teh noobz

iTrader: (4)

I used 3 relays for the ECM and a 4th for the fuel pump. Grouping by the fuse ratings ensures that you don't overload the relays.