I own a small 2bdrm, I bath rental home built in 1940s. There are both 2 & 3 prong receptacles. Using a tester, I noticed the 3-prong ones as "open" thus they are not grounded. I would like to convert all my receptacles to 3-prongs and ensure they are all grounded properly. I've not tackled such a project like this before, but am pretty handy and willing to do myself vs hiring a contractor.

I removed the cover plate on one receptacle hoping the junction box was connected to metal conduit-type tubing so the junction boxes would likely already be grounded. Instead, it appears the wiring is NM as I'm told when I described it to an retired electrician working at home depot.

There is a crawl space but it's very tight. The ground beneath the house is uneven in spots making the clearance very challenging w/out leveling the dirt in some spots.

I need a how-to, detailed step-by-step instructions in how best to do this conversion myself correctly. Would appreciate more than one option to do this project -- difficult vs easy method if there's such a thing.

Thank you, herkyfred

There is some stuff going on here, which may or may not be of use:

https://www.askmehelpdesk.com/electrical-lighting/multiple-baseboards-multiple-thermostats-one-circuit-402505.html

We can keep your stuff in your own thread. 3 prong outlets can be used ungrounded provided they are marked no equipment ground and GFCI protected.

Your right, that doesn't give you a ground and you wish to re-wire. Good.

Check out the boroscope in the link above because that is probably one of your best tools. There is also some fishing links.

The wires are likely stapled in the wall and access will be very tough. You not supposed to leave orphaned wire in the space either.

Some wall destruction may inevitably have to happen.

You might be able to remove an outlet cover and physically damage the box and peek around with the boroscope, fish wires through and replace the box with an old work box.

It won't be easy.