Wiring Question

[80K25]

I may have stumbled across a new 5.3L to replace the one I got screwed out of last time (long story). Anyways, if I wind up buying it, I want to modify the factory wiring harness to eliminate the factory fuse block to make the install a bit cleaner.

On that note, how many of the fuses are actually used by the PCM / engine? I know a whole bunch of them are used by other things like the horn, headlights etc. How many of the relays are used by the PCM / engine?

Keep in mind that my truck will be equipped with a standard transmission, so anything that might be been fused for the automatic can be eliminated

Thanks!

[RedHeartbeat]

Two fuses, one for constant 12v and one for switched 12v.

[80K25]

Really, only the injectors have a seperate fused power source?

Why is it that when I see aftermarket stand alone harnesses they have like 6 different fuses?

[80K25]

Awesome! Thank you!

I want the ECM mounted on the fenderwell similar to stock, with a custom built fuse / relay center to power and control the engine, along with upgrading my headlights and a couple other under-hood components.

I want it as simple and clean as possible

[modular93fox]

yeah,
4 for the injectors, 2 for the coil packs, 2 for o2 sensors - one front, one rear, 3-4 more for pcm power/trans power, and something else... heres what i did



one relay is for the fuel pump, one relay is for the switched 12v, and for the switched 12v wire i simply used the DIST. power wire from the factory fuse box plug.
clint