Service four wheel drive

[Brian Frazee]

Y is it when I put my brights on my radio and dash light go out and it tells me to  service four wheel drive?

[JimCost2014]

1 hour ago, Brian Frazee said:

Y is it when I put my brights on my radio and dash light go out and it tells me to  service four wheel drive?

Welcome to the site.

 

Just like going to the doctor, the more information you can provide, the better the folks on the site can diagnose the problem.

 

Year of truck, model, miles, original owner, mods, original battery, any warranty work done to truck, and so on will help tremendously.