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REAR WINDOW DEFOGGER — Filament Check

EL-118prose procedure

Classic voltage-drop technique — beats trying to do continuity on the printed elements because the resistance is very low. Half-rail (6V) at the middle of each strand confirms intact filament.

Continued from EL-117

Filament Check

  1. 1
    Attach probe circuit tester (in volt range) to middle portion of each filament.
    1. Expected: ~6 volts (normal filament)
    Normal-filament test — voltmeter on middle of filament reads ~6 volts (mid-rail).
    SEL263
  2. 2
    If a filament is burned out, circuit tester registers 0 or 12 volts.
    1. 12 V → break is between probe and [-] rail (downstream of probe)
    2. 0 V → break is between [+] rail and probe (upstream of probe)
    Burned-out filament between probe and [-] rail — reads 12 V (all voltage at probe point because break is downstream). Below: burned-out between probe and [+] rail — reads 0 V.
    SEL265
  3. 3
    To locate burned out point, move probe to left and right along filament to determine point where tester needle swings abruptly.
    Locating burn-out point — slide probe along filament; voltage swings abruptly at break.
    SEL266
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