Turn Signal Control Arm Bulb Replacement?

[springer1981]

I don’t know how you made it happen.
This is what I get

Local auto parts store and ask for 1864 or 1820 bulb.

The 1820 isn't as bright.

 

[Mogman]

Well to begin with you should be searching for a 28 volt bulb not a 24V bulb, the operating voltage of a HMMWV is 28V, You can no doubt find 24V bulbs that would fit as there are MANY miniature base bulbs out there but they would have a shorter life than the same bulb in 28V.

 

[Mogman]

Most small DC bulbs have a tolerance of +5% so a 24V bulb would be operating out of spec at 25.2V and above

 

[Action]

Just make sure they are listed as 28V bulbs

1873 is a 28v bulb.
i said to look up 24v because that will leadyou to cheaper 1873 on epay. I guess you could just search for “1873 bulb”. The lower price seller just happened to put “24v” in their description. I did not tell anyone to use 24v bulbs.
I dont tell people my truck runs on 28 volts. I tell them 24. Do you tell Best Buy employee that you need to find a 14v radio for your car?

 

[springer1981]

1873 is a 28v bulb.
i said to look up 24v because that will leadyou to cheaper 1873 on epay. I guess you could just search for “1873 bulb”. The lower price seller just happened to put “24v” in their description. I did not tell anyone to use 24v bulbs.
I dont tell people my truck runs on 28 volts. I tell them 24. Do you tell Best Buy employee that you need to find a 14v radio for your car?

That is typical of charging systems. All my 12v cars run at 13.8-14.3 but I still buy 12v bulbs. I'd bet the difference in the 24v vs 28v bulbs is marketing. It's a 24v system that charges at roughly 28v. I'm sure either bulb would be fine.

 

[Mogman]

The reason automotive bulbs are marked 12V is because the average auto driver does not understand squat, they are actually designed for 14V on the other hand when you move into industrial lamps such as the 1873 and the 1864 they are marketed at the actual operating voltage.

The 1157 for example is rated at 12.8-14V but walk into an auto parts store and ask for a 14V bulb and they will look at you like you are an alien from outer space.
So yes it is a marketing tactic to mark automotive bulbs as 12V because of the ignorance of the average auto driver.

Edit, the reason the 1157 has a "range" is because it is a DOT bulb, 12.8V is the minimum voltage required to produce the minimum DOT rated candle power of light and the 14V is its rated operating voltage.

 

[springer1981]

The reason automotive bulbs are marked 12V is because the average auto driver does not understand squat, they are actually designed for 14V on the other hand when you move into industrial lamps such as the 1873 and the 1864 they are marketed at the actual operating voltage.
View attachment 863733
The 1157 for example is rated at 12.8-14V but walk into an auto parts store and ask for a 14V bulb and they will look at you like you are an alien from outer space.
So yes it is a marketing tactic to mark automotive bulbs as 12V because of the ignorance of the average auto driver.

Edit, the reason the 1157 has a "range" is because it is a DOT bulb, 12.8V is the minimum voltage required to produce the minimum DOT rated candle power of light and the 14V is its rated operating voltage.

Just an FYI, I'm not suggesting anyone here is wrong, right etc. The same can be said for the bulbs in question. All the listed bulbs and numbers are listed for both 24v AC/DC and 28v AC/DC

 

[Mogman]

Just an FYI, I'm not suggesting anyone here is wrong, right etc. The same can be said for the bulbs in question. All the listed bulbs and numbers are listed for both 24v AC/DC and 28v AC/DC

View attachment 863734

Don't mean to get picky but now you are referencing an LED bulb, I was referencing incandescent, also referencing 24 and 28V is marketing, I would bet the actual operating voltage on those LED lamps is much wider than 24-28V

 

[Retiredwarhorses]

27 replies and 2 pages to answer a question on how to replace a lightbulb…LOL

 

[springer1981]

Don't mean to get picky but now you are referencing an LED bulb, I was referencing incandescent, also referencing 24 and 28V is marketing, I would bet the actual operating voltage on those LED lamps is much wider than 24-28V

Good catch, I was rushing to make a meeting and posted after a quick google search and missed the LED part. My mistake. I do see a specific listing difference in 28 vs 24 volt bulbs and a 10% margin so about 2.5-3v+-. Using a 24v in a 28v environment would likely reduce the life of the bulb and result in a slightly brighter bulb.

The bulbs used in my brake lights were specifically marked 24v and they are working fine.

And I don't mind anyone being picky or correcting me especially if I can learn something. I have replaced bulbs at a local auto parts store using 24v bulbs and they still work. Specifically I replaced the directional light indicator. I might look for a 28v replacement in the future because at some level my OCD kicks in, just never know when. LOL

 

[springer1981]

27 replies and 2 pages to answer a question on how to replace a lightbulb…LOL

But it's more than that!! I found the thread to be educational on several levels.

 

[Maxjeep1]

I’m glad that I know what bulb to get..

 

[FlameRed]

Let me contribute to the "How many pages does it take to change a light bulb" thread

I just replaced the turn signal indicator bulb with this one. There are cheaper ones on Amazon now. LED-24-BA9S-W - 24-28VAC/DC T3-1/4 BA9S WHITE

Very bright. This is ok where you only need light in front of the bulb. This one will NOT work for the dash lights for the dash gauges.

 

[JabbaTN]

Thanks fellas for all the replies and details. $7 later on EBay for 10 of the 1873 28vbulbs. Popped new one in and good to go!

 

[Guyfang]

They are backwards in polarity as the dash bulbs, I am not totally sure why everyone has a big desire for LED bulbs, most you find nowadays are crud (is that OK moderator?) and do not last as long as an incandescent, just get some incandescent bulbs....
This of course does not apply to the "real"LED lamps like turn signal and side marker lamps.

Yes sir! Crap would have worked too!