enblethen wrote:
It could be the flashers that are being installed. Normal flashers cannot handle that big of load.
Your profile does not show year of your Sierra. It would be good to know that to research whether yours have an available heavy duty flasher.
Do you have trailer package? You could look under the hood for those fuses. The trucks wiring works relays under the hood fuses and relay panel. These only work if the truck has towing package and the trailer is connected to those wires rather then being tapped off truck's lighting wiring.
You will get a lot of input about switching to LED lamps.
It's a '08 2500HD. I bought it used from a dealer; supposedly the previous owner towed a double horse trailer with it but that doesn't necessarily mean it has the officlal towing package. How would I check for this?
Since I just had the flasher module replaced at my mechanic I don't think I will be replacing it right away. I will see if it happens again, and next time will insist on a heavy duty flasher (unless I switch to LED bulbs first). The mechanic did not tell me that was an option.
