When right turn signal used fuse is blowing out

Our professional automotive electronics technician Jeff, provides the answer to a dead short.

Jeff Armer Jan 01, 2024

STOP/ TRN fuse #12 20amp, location - in the instrument panel fuse box. Is this the one? Fuse blows because you have a short circuit on the wiring that fuse protects. Do you know what that is?

Turn Signal Lamps
The STOP/TURN fuse in the instrument panel (I/P) fuse block supplies battery positive voltage to the body control module (BCM) for the turn signal lamps. When the turn switch is placed in the left or right position, ground is applied to the BCM on the left or right turn signal switch signal circuit. The BCM then applies voltage to the appropriate front and rear supply voltage circuits.

Grounds for the various lamps are as follows:

• G100 supplies the right front lamps

• G101 supplies the left front lamps

• G400 supplies the right rear lamps

• G401 supplies the left rear lamps

https://www.youtube.com/watch?v=oKCLzf4va7M&t=807s

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you have a short in one of the light sockets or a worn wire from the wiring harness. could be the flasher assembly. are the turn signals different bulbs from the brake lights? Does using the brakes blow the fuse? (Rear lights or brake light switch on brake pedal). left or right turn signal blowing the fuse will tell which side has the short. 4 ways only, replace the relay.

Remove the right front and rear turn signal bulbs. If it still blows a fuse take it to your mechanic to find / fix the short circuit. If it does not blow the fuse, replace the bulbs. You may of course also replace the bulbs one at a time to narrow it further as to which one.

If i remember right those have tail light ciruit boards might be a short in that,

If the right turn signal works on the truck then you didn't blow a fuse. Try spreading the prongs inside the receptical to see if that makes the signal work. If it works then you will have to replace it in the near future. If that doesn't work the replace the wire that runs from the receptical to the truck. Hope this helps.

If there's one thing that gets my shorts in a bunch it's trying to track down a short circuit. I had a 79 Trans Am that did the exact same thing that you described. With out looking at it I would say that there is an exposed wire that causes short circuit. It may be in the turn signal switch, or even somewhere in the steering column.

wich fuse, more specific, maybe the problem is with the electrical circuit on the tun lights switc, or it could be on the lights bulbs on the back of the car

The flasher unit will not cause an overload in the circuit.Activate the four way flasher and if the fuse does not trip then it appears there is a short in either the left or right signal circuit when the steering wheel is turned.The position of the steering wheel will determine which side is shorting out if this is the cause

abad ground on that tail light unit could affect current load when turn and stop are used simultaneously. Although one side only is affected make sure of good grnd between trailer and tow vehicle. focust on the tail light unit in question. Replace the bulb. though rare, bulbs have been known to be the problem. If the bulb is breaking filiments ck the filiment orientation. filiments last longer in vertical orientation, where horizontal permits vibration to break the heated filiment when brake is applied.. good luck and let me know if This helped or not.

left side u got a short
u can wire up a buzzer or light to plug into where the fuse goes that blows when u turn on ur left blinker the buzzer will sound or the light will come on ,while the buzzer is on take apart left signals
and check wiring by moving harness around ,when u find the short the buzzer will quit