F 250 2WD Pickup V8-6.9L DSL (1985)
Glow Plug Relay: Testing and Inspection
BASIC TEST
Perform the glow plug system diagnostic test (referred as Basic test) first. If the vehicle passes the Basic test without running any Pinpoint tests, you will
know the glow plug system is functioning properly. The vehicle's problem exists somewhere else other than the glow plug system. If a step of the Basic
test fails, run only the Pinpoint test specified by the failed step. Refer to glow plug diagnostic test point chart for test lamp connections and glow plug
system wiring harness test points. Perform only those services specified by the Pinpoint tests. Operation of the glow plug system is completely automatic.
If after completing a specific Pinpoint test it is determined that a component must be replaced, the glow plugs should be disconnected until the system
has been rechecked by repeating the Basic test to make sure the glow plug system works properly.
Diagnostic Test Point Chart
