Skip the auto shop - Our mechanics make house calls

Q: My trunk light does not come on

asked by on

All of my other interior lights work except the trunk. I tested the voltage of the dome light and it's 12V but the trunk I get 2.4V what's the solution?

My car has 120000 miles.
My car has a manual transmission.

A: The tests you have done so far pretty much ...

The tests you have done so far pretty much tell the tale. If you are not receiving full voltage at the trunk light, then that voltage is being cut off somewhere. Where did you test the voltage from? If it was from the wire before the socket, then you know the issue is the wire itself. If you tested from the terminal or the socket itself, then the socket unit may need to be replaced.

These typically require a bit of wiring but will not be a hard job. If the wire is your problem, you will want to probe the wire with metal pins to be able to test for the section where the voltage drop occurs. Pins will allow you to test for available voltage without damaging the wires. When you find the drop, you may have a short in the wire and need to repair that section. There may be another load on the circuit that is causing the extra resistance. You may find a wiring diagram very beneficial.

I recommend having a certified mechanic, such as one from YourMechanic, come to your location to determine why the light will not come on and inspect for any electrical problems.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How do you use the interior luggage compartment/emergency trunk release?

Your car is equipped with an important safety feature to prevent the possibility of someone being trapped in the trunk. The interior luggage compartment/emergency trunk release can be pulled at any time to open the trunk. Here’s what you need...

Q: I saw this car, and the owner is selling it,

Vehicles that were badly wrecked will usually get a salvage title, which means the vehicle damage was estimated to be more than roughly 70% of the value of the vehicle. Also, from personal experience, anyone with a salvage title car...

Q: I have a mazda 3 2007 and I do not know where the TCM is. It is not under the battery, so where else can be?

The transmission control module (TMC) is located directly on top of the transmission under the battery tray. If you need further assistance with replacing the TMC, then seek out a professional, such as one from Your Mechanic, to help you....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...