Just a thought.....
Maybe it's your starter????(Intermittently sticking)
I thought that my remote solenoid was bad...replaced it...but still had the same problem. Turned out to be the starter itself.
Relay is Ford original part.
Relay is mounted on the firewall.
I will try the truck version next time.
When I talked to the parts guys at the dealership, one of them had a Tarus that ate them on a regular basis (6 months).
Got to be a better part.
Your Sig. line indicates EFI. If you're trying the truck version make sure you get an EFI starter relay. I looked up the parts listing for a 94 F250 (5.8l EFI) and a 1989 Mustang GT (5.0l EFI) and they are the same part number. Here is a pic of Standard Motor products part #SS598
I almost made the mistake of using one designed for 1987 (carbed) F250 and a Ford mechanic warned me that it does not have an internal diode which EFI computers require. It looks like this:
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