How to Install Under Glow On Your Car

by Robert Moore

Installing an underglow kit to your vehicle is a great visual upgrade that is sure to attract attention at the next car show. The underglow kit will include all necessary wiring and mounting hardware. The wiring connections for most kits are ran in sequence, which means a single wire runs from the control box to the first light, from the end of the first light to the second and so on, until the wire from the last light (normally on the passenger's side) returns to the control box. It will also be necessary to install a toggle switch in the vehicle to turn the underglow lights on and off.

Step 1

Open the underglow kit and lay out the lights where they will mount onto the vehicle. The two longer lights will mount under the vehicle doors, and the shorter lights will mount under the front and rear bumper. Lay out the hardware for each light, as well. Each tube will get two mounting brackets and four self-taping metal screws.

Step 2

Lift the vehicle hood and support it with the hood-prop rod. Find a location suitable for the control box, near the battery, and secure it with the double-sided tape. The negative and positive wires should be angled towards the battery, and the light connectors should be facing towards the rear of the vehicle.

Step 3

Disconnect the negative battery cable with the battery wrench first, and then disconnected the positive battery cable with the battery wrench.

Step 4

Mount the underglow light tubes to the bottom of the vehicle, starting with the front of the vehicle. Hold the light tube in position, place the mounting brackets over the light tube and screw the self-taping screws through the bracket and into the vehicle. Repeat this for each tube until all four tubes are mounted under the vehicle.

Step 5

Open the wiring kit for the light tubes; there will be five wires, all with male ends. Plug one end of the first wire into the control box and route it to the light attached to the front bumper, then plug it in. Run the second wire from the opposite side of the the first light tube to the input port of the driver's side light tube. Run the third wire from the opposite side of the driver's side light tube to the input of the rear light tube. Run the fourth wire from the opposite side of the rear light tube to the input on the passenger's side light tube. Run the fifth wire from the output of the passenger's side light tube to the ground connector on the control box.

Step 6

Secure the light tube connecting wires to the bottom of the vehicle with the included wire ties. Do not mount the wires onto any moving part, or where they may come in contact with any moving part. Keep all wires at least 12 inches away from the vehicle exhaust system. Do not allow any part of the wire to hang below the vehicle.

Step 7

Open the toggle switch and wiring kit. Determine what drill bit matches the size of the toggle switch mounting sleeve, and install that drill bit into the power drill. Decide where the toggle switch will be mounted, and then drill the mounting hole. Slide the toggle switch through the mounting hole and secure it by threading the plastic nut over the toggle switch-mounting sleeve until it is hand-tight.

Step 8

Lay out the two red wires for the toggle switch. The wire with the fuse block will connect to the battery (the fuse block will be close to the battery), and the opposite end will connect to the toggle switch connection A. The second red wire (without a fuse block) will connect from toggle switch connector B to the control box. Locate where the wire harness enters the vehicle through the fire wall, and push both of the toggle switch wires through the rubber grommet. Connect the fused wire to terminal A, and connect the end of the non-fused wire to terminal B. Connect the non-fused wire to the positive connector on the control box.

Connect the fused wire to the positive battery terminal and connect the positive terminal to the positive battery post, using the battery wrench. Connect the negative wire from the control box to the negative terminal connector and connect the terminal to the negative battery post, using the battery wrench. Turn on the toggle switch to ensure all light tubes are operational.


  • It is always easier to lay out all wiring and hardware before starting to ensure that all needed pieces are there and accounted for.


  • In most states, it is illegal to drive with underglow lights turned on, as they are considered for show use only.
  • Always connect the positive battery terminal first, and then the negative terminal.

Items you will need

  • Battery wrench
  • Drill with screwdriver attachments
  • Drill bit set

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