Emergency Flashers Don't Flash - why?

Paul1944 wrote:
I just traded for this coach so I'm going through a tough learning process. One thing that I noticed is that my emergency flashers do not flash off and on, they just flicker very very fast, what could be causing this?

It is called "hyper flash" and typically caused by one or more bulbs being blown out OR incadescent bulbs were replaced with LED lights on NEWER vehicles..

LED lights have less current draw and look like a bulb is out to the flasher module.

For those stating to replace the flasher module, that is not always the case in newer vehicles. Many newer vehicles use the body control module (computer for the vehicle body functions) to detect the bulb current and decide to hyper flash.. the body control module is not something that is easily or cheaply replaceable and if you replaced would still do the same thing.

The fix for newer vehicles with body control module is to add a LOAD RESISTOR when using LEDs.

Older vehicles replacing the mechanical flasher module with a electronic (or HEAVY DUTY) module will typically fix hyper flash but on older vehicles hyper flash is caused by TOO MUCH CURRENT DRAW (IE shorted wiring or too many incadescent bulbs).

Older vehicles with mechanical flasher the flash rate slows or even stops flashing with a bulb out or LEDs..