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Troubleshooting Guide
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Test Lamp Kit
This is an inexpensive way to test automotive rear window defrosters and identify broken defroster lines. Less expensive and easier to use than a volt meter the test lamp kit is a 12v lamp with two wire leads attached. By moving the leads over the defroster and watching the lamp light up its easy to find those small hard to find defroster breaks.

If the defroster clears only part of the rear window, it’s usually a sign of a broken horizontal grid line. The first step in repairing this type of damage is to locate the break by visual inspection. The smallest break or crack can cause the defroster to fail.

Preview Test Lamp Instruction Sheet
Adobe PDF (300 Kb)

Be sure to have the work area well lighted. If the break is not obvious after close visual inspection, use a volt meter or 12 volt lamp to help locate the damage. Turn on the defroster and touch one meter lead to each of the wide vertical bars along the sides of the defroster. The reading should be between 12 and 14 volts. If the volt meter shows a negative reading, reverse the leads.

Now take readings at various places along the horizontal lines of the grid to isolate the break. When you pass over the break, the reading will change sharply. If you do not have a volt meter you can use the 2400 Frost Fighter Test Lamp. A really good way to identify broken or "worn out" lines is to switch on the defroster in cold/damp or humid weather to identify which lines are working and which are broken or damaged.   

2400 Test Lamp - $14.95   

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Defroster Troubleshooting Guide

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