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Home >> Mercury >> 1987 >> Lynx XR3 >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - 4-CYL Diesel >> Testing >> Glow Plug Control Diagnosis >> Dropping Resistor

Dropping Resistor

  1. Disconnect dropping resistor (located in air intake at engine manifold) from wiring harness. Connect test lamp between dropping resistor input terminal (on wiring harness), and ground. Turn ignition on.
  2. If lamp does not light, check harness between No. 2 relay and dropping resistor. If lamp lights, go to step 3).
  3. Connect an ohmmeter to connector terminals on resistor. If reading is less than one ohm, dropping resistor is okay. If not, replace resistor.
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