Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.
Have the correct replacement application and the starting circuit assessed, including the loads, connections and control behavior associated with each failure, before fitting another relay.
Source: This question and its visible discussion, including any clearly labeled editorial corrections. Owner reports are distinguished from other participants' experiences. Follow-up guidance is not a confirmed diagnosis. Fluke: Diagnosing voltage drops https://www.fluke.com/en/learn/blog/automotive/electrical-automotive-troubleshooting General support for testing loaded electrical circuits. Use the actual vehicle wiring and specifications.
ford f159 eats solenoids !
The owner of a 1988 F-150 reported four failures of the fender-mounted starter solenoid or relay within ten weeks. The replies did not establish why the failures recurred.
Reported outcome: No underlying cause or lasting repair was reported.
The meaning of cooked was not supported by photographs or measurements. Another truck's starter history does not establish this vehicle's cause.
