How do I change the battery on the 3-beam level?

E: ADJUSTMENT
1. HEADLIGHT BEAM ADJUSTMENT
CAUTION:
Turn off the light before adjusting the headlight beam level. If it is necessary to inspect the beam level, do not keep the light on for two min- utes or more.
NOTE:
Before checking the headlight beam level, be sure of the following:
• Check the area around the headlight for any scratches, damage or other types of deformation.
• Make sure that the vehicle is parked on a level surface.
• Make sure that the inflation pressure of tires are correct.
• Make sure that the vehicle fuel tank is full.
1) Bounce the vehicle two to three times to normal- ize the suspension.
2) Make certain that someone is seated in the driv- er's seat.
3) Measure the distance between the low beam bulb centers, and the height of the bulb center

Headlamps
The headlamp driver module (HDM) is an electronic module that provides electrical power to the vehicle low beam headlamps. The HDM is controlled by a pulse width modulated (PWM) ground signal from the body control module (BCM). The BCM determines the desired lamp intensity using the ambient light sensor, multifunction switch and the park brake switch as inputs. In general, the HDM will operate in 1 of 3 modes:
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Reduced Intensity Mode: This mode is used by features that do not require or allow maximum low beam headlamp intensity such as daytime running lights (DRL) (nominal: 85% duty cycle).

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Full Intensity Mode: This mode is used by features that require full low beam headlamp intensity such as low beam headlamp operation in manual or auto modes (nominal: 100% duty cycle).

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Off Mode: This is the default mode of the system that will occur when none of the features described above are active. The BCM will deactivate its PWM output (0% duty cycle) during this mode.

The normal battery voltage input to the HDM must be between 6 and 16 volts DC to operate. Any deviation to these values could cause improper operation.
The ambient light sensor is a light sensitive transistor that varies its voltage signal to the body control module (BCM) in response to changes to the outside (ambient) light level.
You should have the modules scanned for codes first off. Not the engine control module .( BCM ) body control module , yes . That's the first thing I always do !
Could be a bad ambient light sensor or the headlamp driver module. You could check voltage at the battery with engine running, should be over 14 volts. If you don't deal with this sort of thing on a regular basis I'd take it to someone who does !
You

there several things that keep the headlamps on #1 the beam selector lever rod is stuck on . does the beam selector move freely and click when changing beams. # 2 dash pad covering ambient light sensor #3 headlamp on sense wire shorted to power . #4 Bad body control module. #5 headlamp control relay faulty.

from the front or back of the head light , there will be 2/3 adjusting knobs / screws . Place the vehicle on a level surface about 3 feet from a plain coloured wall. You will see the centre of the beam( High beam). The centre of the beam is to be at the same height as the centre of the head light lense and properly adjusted pointing slightly to the passenger side of the vehicle . This prevents full beam in the eyes of oncoming cars.

little connector inside down under the upperprint clean this micro little white connector.
Clean all your spring and blade contacts.
Look for corrosion on the springcontacts.

I know it's 3 years old this question but I had the same problem. Good thing is the makita battery willl fit. I just got one from ebay works great

1500mAh 7.2V BATTERY FOR MAKITA 7000 7002 7033 192695-4 632002-4 Cordless Drill

Follow these steps to adjust low beam light on your 389 Peterbilt:
1. Park on a leveled ground, at least six feet away from a garage door or a wall
2. Use tape to mark the vertical centerline of the beam on the wall or garage door
3. Backup about 25 feet
4. Now use the provided vertical/horizontal screws to adjust the light. Aim it - two inches below the tape -and to the right side of the tape
5. Remember to check the state laws on headlight beams before making any changes

Does changing the battery make a difference in the signal strength? With my Dewalt, I have to change batteries frequently and also clean the battery connections with a soft eraser to keep a strong beam.

One of the reasons, I went with the Dewalt versus the Spectra, I was told that battery life was better in the Dewalt.

When the tool is level, the lasers will stop flashing, but check out the batteries too, because if they're weak, the tool will not level, and the lights will continue to flash .

DeWalt has a pretty good warranty system. Go to there website: www.dewalt.com and find out on warranty, they will be able to direct you.