Skip to main content

Reply to "Bluerail and Deadrail Mod to MTH 7Premier R-2 Engineering Sample. UPDATE 10/01/21 IT'S ALIVE!"

A little couple hour job I took on this weekend was replacing the incandescent headlamp with an LED. 

Turns out it wasn't as easy as I figured it would be.  The replacement required disassembling the entire front end to get at a tiny screw that held the lamp assembly on.  There's an opening in the assembly on the top side that allows light to pass through into where the number boards should be (which I don't have, but will figure out someday).

Making things even tougher, there was an EACT 3mm diameter hole through the front portion of the chassis and up into the lamp assembly that the 3mm bulb could just squeeze through to install.  On my LED's the little flange at the base was *just* wide enough to prevent from passing through the small hole in the chassis, so I had to open it up a bit.  Eventually, I ended up just cutting it and using it like a tie-town bracket.  It's hidden when assembled so I'm OK with that.

But since the LED can't go all the way up into the lamp assembly, I had to create a stiff "mount" that had enough tension when mounted to force it as far up into the assembly as possible.  I ended up building a little harness / light piece that I could connect to the front portion of the disassembled chassis and left just enough wire to not get jumbled or pinched when installed.

Traced my positive leads all the way back to the original harness, and I yanked them out to prepare them to get wired into the new configuration some day soon.  But after a couple hours, it was all reassembled with the LED shining bright!

Pics of the little custom light harness and the final assembly shown below.  The resistor is in the wires prior to the molex joint.  There was no way for me to fit it in right at the light and make the bend around out of the lamp assembly.

20210417_18291820210417_18342020210417_18342520210417_18482620210417_18511620210417_191313

Attachments

Images (6)
  • 20210417_182918
  • 20210417_183420
  • 20210417_183425
  • 20210417_184826
  • 20210417_185116
  • 20210417_191313

OGR Publishing, Inc., 1310 Eastside Centre Ct, Suite 6, Mountain Home, AR 72653
800-980-OGRR (6477)
www.ogaugerr.com

×
×
×
×
×