I have a yellow light with a symbol that looks like a engine is shining...i have a -95 blazer...what can this light indicate??

 

That is your check engine light. You need to get a reader plugged into your OBD computer to read the code that triggered the light. Once you get that code, and there are many, there's section here that lists many of the codes and what they mean.

In case you don't know autozone will usually let you borrow a reader from them with a deposit of your driver's license. If you don't know where to plug it in or how to use it sometimes the people working there will help you.

 

Bear in mind that since the truck is a '95 it may require a specialized code reader that AutoZone, etc may not have available. It might require a trip to the dealer.