Annoyed! Left turn signal keeps blowing fuse

Unplug the hood harness and go for a test drive

if it still pops then it’s not in the harness you unplugged .

Remove the bulb from the rear light and go for a drive ,
If it still pops you know it’s not the bulb
It could be inside the light So unplug the rear light and go for a drive ,

if it still pops then find the next connector up by the cab and unplug it etc

just start at the light and work your way back to the switch unplugging connections
until You go for a drive and it doesn’t blow , then you know which section of wire it’s in .


I would also make a circuit breaker to replace the fuse .
Use the same amp rated circuit breaker as the fuse , and make some jumper wires with the spade connectors on the ends to plug into the fuse box where the fuse goes .

that way it will reset itself and you won’t be having to stop and replace the fuse all the time

 

As mentioned, this happens with or without the trailer.
It started without the trailer. My trailer is used also with 3 of my other trucks with no issues. Its definitly the truck.

Fuse only blows when the truck is being driven and the left turn signal or hazards are used. Does not blow with right turn signal. When truck first starts up, I can use turn signal and it wont blow. Once I start driving or I park after I drive, it blows once I use the left signal.

It seems like when the truck airs up, is when the short appears honestly.

No extra turn signal lights that werent already on it before from factory. No plug I can disconnect to the hood turn signal. Tleast not one I can find.
Hood turn signals are LED. Have dissasembled them and check connections, everything seems fine in turn signal.
Actually rewired the rear turn signals/brake lights with new 4" round lights thinking that might have been the issue, it still blows the fuse.

 

Best bet is to pick a left turn signal and follow the harness back. More than likely the harness has rubbed through on a clamp or something else.

 

Go back and read post #9 by haycarter. 2 others have mentioned the trailer cord and I don't see anything where you addressed that. Also see AModelCat above.

 

You’ve just got to start eliminating sections of the harness

the easiest one to eliminate is the trailer cord
Just unplug it and go for a drive bobtail .

If it still blows the fuse , find the next harness connection and unplug it and go for a drive , etc

that’s how you isolate which section of harness the problem is in

 

I mean I just really wanted to know if the line I had colored on that diagram looked right cause I really dont want to chase anymore wires or anything lol
I just want to run a new wire and call it good

 

Im pretty sure I already removed it once in the process of diagnosing the issue but I can do it again to make sure again.