How I added reverse light switch for my HMMWV

[doghead]

Yes, amps is the rating to be concerned with for this situation.

These would work fine.

 

[donquijote]

Good to know for future reference!

 

[doghead]

If it were my project, I'd probably weld the hole closed and re-drill and tap it for the cheapest switch I could find (less than $10).

But, you guys were looking for a switch for less than the ones advertised on ebay, that included a bushing to fit the existing hole.

Or, I'd go the easy route and buy the one for $25 that fits.

I guess my point is, you have options. Don't give up.

 

[donquijote]

A simple solution assuming you have a welding machine on hand, which most people don't and plenty of shops wont screw with doing that for a walk in customer.

I wasn't looking for a cheaper option when I ran across this problem. I had bought the NSS part referenced on the A1 configuration like common sense would lead you to. So after I bought it and then removed the shifter, you realize the bushing issue. So you buy the switch and then realize there is no bushing and end up with the issue Shamrocker has, not thinking to look at the A2 configuration and buying the reverse switch part# which includes the bushing. If there is an OEM part, I usually prefer to use that.

 

[Shamrocker1]

Very Impressed with your recent posts and research. THANK YOU!

Doghead, I never thought I would say this but “YOU ARE THE MAN!”. I hope you can see how many people your latest posts will help now that you understand what we need and why it’s not simply a shelf item or in the Tech Manual. Very thorough research sir and outstanding results. I’ll be ordering these tonight. I can’t thank you enough, Sham.

 

[Shamrocker1]

Voltage ratings are solely for the “insulation” or safety factor of any device. Current is your only concern here. I agree with doghead on using LED reverse lights to minimize current so that almost any switch would carry.

 

[Shamrocker1]

Don and doghead, great work and research! You guys have totally convinced me that this IS the place to be to get help on my Humvee from intelligent individuals like yourselves. Take a bow. You either got tired of my griping or you like a challenge like me. Either way, great work men!

 

[Shamrocker1]

Wrong O.D.

https://www.belmetric.com/91618-c-217_225_898/ts09687-91618x350-steel-insert-p-4732.html

Looks right but doesn’t give O.D. measurements. If this is what it looks like and O.D. is 3/4”-16, mystical bushing busted without even cutting the length.

They emailed me back and said that the O.D. is proprietary and not given but promised me it wasn’t close to 3/4”-16. Woulda been perfect.

 

[doghead]

Here's another possible option.

http://www.mylampparts.com/Products/Brass-Reducing-Bushings-38-IPS-F-x-12-IPS-M__SL00442.aspx

The outer thread pitch would be off by two, but being so short and brass I bet it would work ok.

The inner thread pitch is correct.

Not 100% sure on diameters, but they should be very close.

It may be worth a try.

Might also find it a a hardware store in the drawers for lamp parts.(in the fasteners isle). Like at Lowes or Home Depot.

 

[Tonka truck]

The bushing is 9/16 18 X 3/4 16

 

[Shamrocker1]

I found the switch on eBay that already has the 3/4-16 threads. It is a Massey Ferguson Starter Safety Switch Part Number 181140M94 for $11.04 shipped free. Problem solved with a huge victory for us all! The wiring terminals are different but the non-ambulance HMMWVs do not come with the reverse switch connectors anyway so you’ll terminate your own wires regardless. Diligence paid off for once. Tx to all who helped!

 

[doghead]

So, that switch should be readily available at tractor parts stores.

Like here, http://www.tractorpartsinc.com/mass...neutral_safety_switch_181140m94_4486_prd1.htm

And here. And the description tell all the tractors it fits(for finding at local shops).

https://www.tractorpartsasap.com/Neutral-Safety-Starter-Switch-p/111507.htm

 

[doghead]

Also, I changed the thread title to help in the future.

 

[jsgrimmjs]

After careful mic measuring and a TPI gauge, I got the same thing last night but, like you, failed to find the bushing anywhere. I do not have a Lathe, however, I will be using a 3/4” - 16 compression fitting and boring out the center and tapping it to a 9/16” - 18. I paid $9.95 for a brand new NSS and I also refuse to pay the extra $50 - $75 for a ten cent bushing. If we could only find who made these. Thank you for an accurate answer to my question. BTW, I got penalized by doghead for starting different threads for a conversation on the switch and then another conversation about the bushing. Though initially not related questions, he merged them and gave me a point. Thank you!

Here's a $3 solution. Buy a GM spark plug or find a used one. Outside thread is 3/4-16. Knock the center out. Tap inside to 9/16-18, then cut off at end of threads. There you go, perfect bushing