CHEV Electrical Question-Sorry guys

[Bobs69]

My 95 beretta, 3.1.  Rear defrost tries to work, you can see the lines starting to de-thaw, but it just doesn't do it.  I was told that it had only been getting 6 volts.  I never checked for myself.  Is there a relay or some sort of metreing device in the circuit?

[Ghoste]

There is a relay for those things but I can't tell you much beyond that.