Peterbilt 379 Headlights ?

The 365/367s I am seeing do have the single rectangular lights like the 379 I have pictured; but, they have an entirely different one-piece fiberglass hood and no external breathers.

375/377s are aerodynamic hoods, much like a T600 KW, with the headlights molded into the fenders.

I guess, for whatever reasons, the single-light 379s I see have had their lights swapped.

I will say this, a single rectangular sealed beam, while not nearly as impressive looking, will outreach any set of duals I have ever been behind; and, a single round will outperform them all.

Any of them will reach out farther after being rewired to receive full alternator voltage; but, they won't last nearly so long.

Of course, if they have got those pathetic molded-in headlights with the foggy plastic lens, provide them with full voltage and they will soon melt holes in the plastic.

As delivered, most will only read 9- or 10-volts at the headlamp; rewire them to receive full alternator voltage and whatever the alternator is putting out is what the headlights will receive, 14-volts +.

After driving one I have rewired and then have to drive one that isn't, it's like driving those old six-volt cars with a generator.

One thing I did notice in my headlight investigation, while Kenworth W900 and Peterbilt 359 have the absolute best wiper setup, with the blades parking straight up in the center, every later model Peterbilt I looked at going back 40-years, save for the 378, has wipers mounted like a pickup truck, forcing one to have to climb over the engine to access the right side wiper.

The 378 is like most earlier models, with the wiper arm "posts" both being outboard and the ends of the blades pointing at each other when the wipers are at rest.