Left blinker not working

have you tried refilling the blinker fluid?

 

Just had a thought, does your left turn indicator in the cluster blink when the left turn or hazzards are on?

 

You're a life saver thank you

 

It will come on for a quick blip then stay off

 

Have you owned this truck since it was new?
Has it ever worked while you've owned the truck?

 

If you have an electrical probe that uses a halogen (nor LED) bulb, you could jump to ground and verify flashing bypassing the vehicle lamp(s). If it hyperflashes while doing this then you 'll know it's a bad ground on the vehicle lamp(s).
Best probe location would be at connector C10, behind the Combination Meter, at connector output, no connector attached.

 

Hmm that kinda suggests maybe something on the circuit is shorted to ground and the module is shutting the circuit off to protect itself.

Would need to scan it for codes to see though.

 

I used my obd2 reader and the truck didnt show any codes

 

A generic OBD reader is only gona read emissions related codes from the PCM, it's not gona read codes from the Combination Meter.

 

If you have the reader, see if you can get to combination meter control unit and see pids for turn signals. This way you can eliminate the switch malfunction and concentrate on the wiring from the meter to lights. Control unit will change status of the pid from off to on, etc. to reflect the position of the turn signal switch.

 

Remove the lamps with holders from left side light assemblies (front & back). Use them for test. Using lamps provides correct load to circuit and isolates from vehicle harness.

 

He’s a NASCAR fan….

 

Fact

 

Just had another thought, have you checked your trailer plug/wiring for any shorts or green crusties?

 

I did and there was power but in doing that my tails now read an open line, it keeps popping the 7.5 amp fuse

 

When/how did this issue start?
Has it been like this since you bought the truck?

 

That sounds like he went to NASCAR track.

 

Which 7.5A fuse is blowing?

 

The tail 7.5 in the cabin my the divers foot

 

It started intermittently about a month after getting it and now it just blips then stays off. I’m the third owner and the previous owner never had this issue