Please post more info.
You just bought a 1988 IH, right? Does it have air brakes? If it has air brakes and you are
new to such, it may be simply the Low Air warning -- in which case you just start the
engine and let it build up air pressure before you try to drive.
Oh, actually, if this is the case, then you need to learn about air brakes before you try
to drive. No offense intended.
Lights? Probably different problem. Let's figure out if you understand the brakes
first, please. Kind'a important.
All my best,