Inexpensive Way to Test Rear Window Defroster Lines
Locates Small Hard to Find Breaks
The CRL Test Lamp Kit is an inexpensive way to test automotive rear window defrosters and identify broken defroster lines.
Uses a 12 volt lamp, with two long leads attached, and marking tape.
Move the leads over the defroster and watch the lamp to verify defroster is working and to locate those small, hard to find breaks.