Rear running lights keep blowing fuse. Won’t stay on

A question I have to ask. Who looked at your car? I think an electrician would have been able to locate the problem (it is most likely a very hot short somewhere). Also, if the fuse immediately pops, that is not good! Something, somewhere is touching metal and is ready to fry the circuit. Having delt with shorts before, it is important to have an electrician check it out. He/she will find it.

 

Are you talking about the rear "Tail Lights" ?
No such thing as "rear running lights".

The problem could be that there is a short in one of the light assemblies itself
Either LEDs or a conventional bulb.

When you took it in to have it "looked at" you should have told them to find what the problem IS......instead of just to check the wires.

 

That the fuse blows at once is good, because it is easy to chase. You could unplug all the lights on one side, put in a fuse and see if it blows. Then plug them back, unplug the other side, and see if that blows. This would start to cut down the possibilities.

If you can track it down to one side, you could start with a good fuse and all the bulbs unplugged, plug them in one by one and see exactly which one(s) has/have the short.

What makes them think that it is the fuse box rather than a wire? Which box do they think it is?

 

Probably becuase they weren't thinking?

 

I was thinking that if the problem was in the fuse box the fuse might blow even if every light was unplugged. I was also wondering how they came to the most expensive possible conclusion and if the fix is guaranteed to work.

 

I know............my qoute was a poke at them. I was trying to be funny.............LoL

 

Most likely guess work.

Your idea is good but needs a little modification.
At some point, the lights on BOTH sides should be disconnected at the same time.
Then the wiring should be disconnected one side at a time.

Changing out a fuse box is a BIG, expensive job and should not be done until you can prove that the problem really is there.......not a guess.

 

Look for corrosion and debris or out of place contacts in each socket and make sure the base of each bulb looks normal. It wouldn't hurt to individually test the bulbs. A burn mark on the base of a bulb is a sure sign that you had a short.

 

Change your cabin air filter.

 

You are thinking he has a bad ground on his air filter? Nothing the dealer can't handle...

 

I’m thinking mice...