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Glow Plug Test A Test Lamp Signal Correct

NOTE: Ford has updated it's Glow Plug Testing procedures please see TSB 88-11-19 in the TECHNICAL SERVICE BULLETIN Section.
  1. Remove all leads from glow plugs. Connect a test lamp between glow plug power relay output and ground. Turn ignition on. Measure voltage at each glow plug lead whenever test lamp is lit. Voltage should be at least 11 volts. If voltage is ok at all leads, proceed to step 4. If voltage is not ok at 1 or more leads, proceed to step 2.
  2. Turn ignition off. Disconnect fusible links from chassis harness and engine glow plug harness. Check continuity of fusible links with an ohmmeter. If 1 or both fusible links are open, replace fusible link and repeat step 1. If both fusible links are ok, proceed to step 3.
  3. Turn ignition off. Disconnect engine harness from chassis connector and all glow plugs. Check resistance between chassis connector left and right bank glow plug terminals and each glow plug lead. If any resistance is 1 ohm or more, replace engine harness and recheck vehicle operation. If resistance is more than 1 ohm, proceed to step 4.
  4. Turn ignition off. Remove test lamp from power relay. Check resistance between glow plug terminal and metal case of glow plug. If resistance is less than 2 ohms at all glow plugs, glow plug system is OK, problem is engine related. If resistance is more than 2 ohms at any glow plug(s), replace glow plug(s), reconnect harness and check vehicle operation.
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