Originally Posted by TinyJaime
Yes Leitmotif,
I work with 460, 240,120, & 24 v circuits ac. Now I am getting proficient with 12v dc.

The thing I was hoping for was to get an what the factory watts were and not estimate too high. I could take the12 volts times 9 amps approach to get the max running load amps would be but I know its not accurate I believe gm would not cut it that close or there would be a lot more blown fuses. Since its a motor driven circuit and the start up amps should be different than running amps in theory it would throw my running load calculation off. I know I will not be running everything at once but just wanted an idea.

I forgot to mention I was adding cooling fans to the radiator plus adding relays for those fans and relays for the headlights. I want to keep the majority of the hi amps of what I can outside the cab of at least what I can. Its crazy seeing all the power ran off the ignition and headlight control.

Lastly I am using the 12 volt and watts for the amps to size the wire not the 13 or 14 volt so that should give me my cushion plus I plan to use min of 14 garage wire and bigger since I have a surplus of it.

I guess if there is no info on the factory blower and w/s wipers I will just yank them out and do a bench test. I was hoping someone here would know or where to find it. Those where the only two I did not have.

If anyone one else has any input I would love to hear. Thanks to all.

I thought you sounded competent and qualified.
Your bench test is the final criteria. Dont trust factory specs all the time - they do cut to bare bone to save a nickel on copper. You have seen that in industry - automotive is worse. Oversize wire is always good.

Yeah I also do all that industrial electrical also. 12 VDC is not that different Ohm Law and the rest apply