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Thank you! 👍

Hey, Brother...Was this post meant for http://www.steelsoldiers.com/showthread.php?83549-What-have-you-done-to-your-5-ton-this-week&p=1820504&posted=1#post1820504...?? Just making sure it gets to the right place :)

A brief comparison of before, middle and after... M809-series OEM M939-series Upgrade Battery Box M915 Battery Box w/ M939/M939A1-series fuel tank

So, I finally got it all finished up this morning. I connected up the right side in-board secondary air tank to the existing air system. I also dressed up the the out-board right side primary air tank's drain valve pull cable. I mounted an eye-bolt to the front/top corner of the battery box lid...

An improvement, yes! They're like dragon's teeth;) You're not going to slip on those!

Probably just a replacement part with improvements. The non-skid surfaces on the steps alone is much better than I've seen on the older boxes. Regardless, it's a very sturdy, well built box [thumbzup]

Correct me if I'm wrong, but this box may have been an upgrade kit to the original OEM box. I dunno'?? The battery box in the -24P shows a back on it, but its construction is a little different.

I installed the rubber coated plywood liner into the battery box. I bolted the liner down using the three existing pre-drilled hold down bolt holes; two on the left side and the right/rear. I laid in the outer most hold-down and placed a bolt through the hold-down bolt clip adjacent to the...

I received the Deka Group 31 battery hold-downs (Deka p/n 06165). I found these on eBay. I originally had ordered the Deka 06166, double group 31 hold-down, from eTrailer, but they were back-ordered through mid-January. I may re-order the double hold-down later, but for now I wanted to get the...

I added an Abus No. 110 multi-hinged lock hasp to secure the box. The multi-hinge design gets the hasp up and over the bottom lip of the battery box eliminating any mounting guesswork. The hasp was mounted to the outer reinforcing channel under the box. I used 3/16" x 3/8 "-1/2" steel blind...

Once the battery box was installed, the tolerance between the fuel tank and box for the rear rubber tie-down clamp was too close. The front between the box and fender was OK, but for balance I decided to move both out to the side. The tie-down hinge brackets were mounted on the saddle...

Oh, and, pay no mind to that metal cancer on the rocker panel :oops: ;)

Once I get the batteries installed, I will pull the truck out of its space and get some better side photos. The guy who rents the space next to me, who is never there and has a big fat RV, decides to show up right at the time I want to do this project. Needless to say, it was quite the challenge...

Once the box was mounted in place, the bus bars and Solargizer circuit box were installed. I made sure to mount the Solargizer box so I didn’t have cut or add to its wiring. The main positive cable was a little long, so it was cut down, a new lug terminal was swedged on and some new red shrink...

I removed the existing battery box. I also removed the two bus bars, all cables and the Solargizer box from inside that box. All those accessories would be reused in the new box. As a side note and on the same day, I also installed a "new-to-me" M931 58 gal. fuel tank to include some new...

After getting the box home, I gave it a quick cleaning, removed the accessories (hold-down, wood liner, slave receptacle) and put a nice coat of 686 sand on it. While I was painting and prepping the box for installation, I found that removing and replacing the cover was a little bit cumbersome...

About four years ago I modified and installed an M939-series battery box up grade on my M818. It is a very sturdy, modular design allowing easy access to the batteries. In addition, if you use only two batteries, it lends to more storage space. It did come with some drawbacks including hanging...