Re: Switched 12 v source for EFI, Ignition box, Fuel pump and Fan
I would put in a 15A fuse as that's what 14AWG wire is rated for. You'll most likely be over 5A on the circuit as well.
Your two relay coils are going to draw a very small amount of current, well under an amp.
The ECM will probably not draw much, say two amps just to have something. It has another 12V connection from the battery, correct?
The box will not draw much either, maybe a couple of amps max as it is just the turn on power from the ignition.
Concerning the coil, isn't it fed directly from the Hyfire box? If so, then that supply is coming from the battery not the IGN circuit.
The starter solenoid shouldn't draw very much if it is in good condition.
I think you'll be safe with everything on the IGN circuit. If the coil is fed from the Hyfire box and it's not that Digital EZ thing they have that uses your old coil to feed the box then it feeds the E Coil then you're looking at less than ten amps on the circuit.
Even if it is the type that uses your old coil as the "trigger" for the box it shouldn't have much draw as the 12V battery supply from the box should be feeding the E Coil and your distributor.
Dart 400-AFR 195-224/224 HR-Powerjection III TB with F.A.S.T. Sportsman XFI
TKO 600-Moser 3.42-Detroit Truetrac
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