Two part light question

[kendelrio]

All-
I was installing the LED B.O. lights that @jeepaddict was kind enough to pay forward and ran into some head scratching questions.

The first question lead me to the next and so forth. I'll try to be as accurate as possible so answers are clear.

I was changing out the rear white LEDs in the BO and realized that when I depressed the brake I had no voltage at the "BO Drive" position on my 3 way switch. I put it in the "BO Marker" position and pressed the brakes and voila... voltage.

My question is this:

Shouldn't I have brake light function on the white triangles when in BO Drive, not BO Marker?

Here is a picture of BO Marker with the brake depressed:



And BO Drive with the brake depressed:



The next part of my question **may** be related....

On my forward "regular" driving lights, I have my side Marker lights, headlights and blinkers. I also have a third bulb that does nothing. It doesn't come on in any position.... any ideas? It's the top one in the following picture:

 

[Mullaney]

All-
I was installing the LED B.O. lights that @jeepaddict was kind enough to pay forward and ran into some head scratching questions.

The first question lead me to the next and so forth. I'll try to be as accurate as possible so answers are clear.

I was changing out the rear white LEDs in the BO and realized that when I depressed the brake I had no voltage at the "BO Drive" position on my 3 way switch. I put it in the "BO Marker" position and pressed the brakes and voila... voltage.

My question is this:

Shouldn't I have brake light function on the white triangles when in BO Drive, not BO Marker?

Here is a picture of BO Marker with the brake depressed:

View attachment 838067

And BO Drive with the brake depressed:

View attachment 838069

The next part of my question **may** be related....

On my forward "regular" driving lights, I have my side Marker lights, headlights and blinkers. I also have a third bulb that does nothing. It doesn't come on in any position.... any ideas? It's the top one in the following picture:

.
When those BO lights are turned on running blackout, wearing NVG allows you to see the truck you are preparing to crash in to the back of . Another light oddity for these trucks is the lollipop lights on the front fender work. They are off if the headlights are on. There is a vendor on here somewhere that fixes the lollipops so they stay on with the headlights with a "bolt-in" wiring fix.

 

[kendelrio]

.
When those BO lights are turned on running blackout, wearing NVG allows you to see the truck you are preparing to crash in to the back of . Another light oddity for these trucks is the lollipop lights on the front fender work. They are off if the headlights are on. There is a vendor on here somewhere that fixes the lollipops so they stay on with the headlights with a "bolt-in" wiring fix.

Ya, the issue I have is the top light on the front doesn't work at all...

The bottom light only flashes for "blinker" and "hazards"

 

[kendelrio]

.
When those BO lights are turned on running blackout, wearing NVG allows you to see the truck you are preparing to crash in to the back of . Another light oddity for these trucks is the lollipop lights on the front fender work. They are off if the headlights are on. There is a vendor on here somewhere that fixes the lollipops so they stay on with the headlights with a "bolt-in" wiring fix.

Also, when I was in the Corps, we laughed about the efficacy of the lights too... and the BO Drive light was hardly better. We almost ended up in a 1000 lb bomb crater except our driver felt something was amiss and stopped the truck.

(I was in the back with the artillery shells and powder )

 

[kendelrio]

After surfing the net, I came across this reference sheet. The bulb I'm referring to is #6-623 Bulb "Running Light"


I have no voltage at that socket on both sides of the truck.

 

[Mullaney]

Also, when I was in the Corps, we laughed about the efficacy of the lights too... and the BO Drive light was hardly better. We almost ended up in a 1000 lb bomb crater except our driver felt something was amiss and stopped the truck.

(I was in the back with the artillery shells and powder )

.
That could have made an exciting night!

 

[charlesmann]

After surfing the net, I came across this reference sheet. The bulb I'm referring to is #6-623 Bulb "Running Light"


I have no voltage at that socket on both sides of the truck.

View attachment 838073

I too am running into this issue. Was going to mess with it but other irons in the fire have taken priority.

 

[kendelrio]

I too am running into this issue. Was going to mess with it but other irons in the fire have taken priority.

Possible answer I just posted in the "Electrical" forum.