Hi everyone,

I'm in the process of creating a chassis harness for my REPU with separate fuses for just about everything. I started with an American Auto Wire Highway 22 kit and have been adding on to it. I've seen the wiring diagram posted in this section for Adaptronic but it simplifies all the +12 v wires and I'd like a little more detail.

The fuse box I have has two 20a fuses ear marked for EFI. One is for constant battery power, the other is ignition. Can I connect everything to these two circuits or should I break things up into separately fused circuits?

What is the current draw of the adaptronic?

What current draw can I expect from 4 AEM coils?

What current draw can I expect from 4 injectors?

 

Great thread!

4 x IGN-1A coils = 4 x 19A (Maximum), so I'd run 100A Fuse/Circuit Breaker

The Adaptronic drives the injectors and I believe that to be in the 20-30A range.

 

I've decided to run a seperate circuit for adaptronic (30a), injectors and other sensors (20a), O2 sensor (5a). But the coils still have me scratching my head. I found a few diagrams for MegaSquirt systems which helped a little, but those just show a single coil system. With 4 coils, demanding up to 100a it seems like I should just wire them directly to the master fuse, and not bother with a separate circuit. Is that what everyone does?

 

The IGN1A coils DO NOT draw maximum current in a real world application. Most vendors who mass produce the harnesses select a fuse rating of 20A, which is plenty. I also run a 20A fuse in my car.

 

I believe this figure is measured Inrush on the system, so a LARGE relay should be used (70A minimum) with 8ga wiring.

Not sure about you guys, but I plan to run a 270A alternator on this build. Huge E-Fan on Radiator, Fans on Intercooler, huge PG amplifier, these ignition coils, Adaptronic M6000 ECU, Injector Dynamics fuel pump, Walbro 416 lift pump, etc.

Wiring is a big deal. This is a total joke if you use 14ga wiring on them. Might as well just run OEM.

 

20A fuse for four coils in most systems. Some cars that draw down the voltage a lot while cranking will pop a 20A fuse under those conditions. On those few cars, a 30A fuse was needed.

12G primary positive and ground is plenty for four coils on a remote mounted battery. If you're using mil-spec wire, you can step down a size. Of course too big doesn't hurt, just adds weight.

One more case where experience matters.

 

Thanks guys. I have a 12 gauge pink wire that came with the kit and its marked "coil". I have it wired to a 20a fuse. Wasn't sure if it was enough for these coils since the kit is designed more for hot rods. Sounds like I should try it and see. Not sure I can get the 12 gauge wire to crimp on the bulkhead connector terminals. I'll cross that bridge when I get to it.

 

Thank you Ludwig.