Abs light. Faking it

Much easier is to fix #### light. If light not blinking at all - check central wire for +12 volts supply.
If light blinking codes and stay on - check the code and fix the problem. How to check codes - easy Sealco Commercial Vehicle Products - ABS Blink Codes

 

Unplug it

 

If light is on for second every time when you apply brakes and not blinking from key on means ABS module powered from stop light circuit only. Check central wire on the pig tail cable for +12 volts. Probably truck side fuse.

 

Don't disconnect or change wiring to the ABS. It's not an OOS item.
As mentioned check the center pin in truck pigtail for power. Spread the pin with a little screwdriver to get better contact in the trailer receptacle.

 

It is not normal. That behavior is a fail safe in case power to the center pin fails. The trailer ABS computer will power up from the hot lead to the brake lights when you step on the brakes.

You have a blown fuse.

 

Say what kind of truck you have and maybe someone can direct you to the fuse.

If it's a Cascadia look for a vertical rectangular plastic black box on the firewall under the hood on the driver's side. There are several relays and fuses in there. The fuse for the trailer pigtail center pin (the one you are looking for) is there also.