The thinner of the 2 red wires,I believe, goes to the starter. It goes back to the firewall, into the plastic sheathing stuff(?), then seems to terminate at the passenger side firewall?
1. It goes down the engine side of the firewall, and hugs the floorboard to the starter, right?
2. Do I simply replace the same thin wire with the new wire from PA Performance?
yup the same connectors should just slap right on it. The thinner wire is the trigger wire that when you turn the key will activate the solenoid. When it is activated the larger wire supplies the power to the the starter. I would disconnect either the + or - on the battery before you do this as if you ground out that power wire it can make some big sparks.
So, which starter do you have now? Single battery lead...stock Ford type, or, mini starter with solenoid mounted to the starter? If you have a single lead, you're going to do some wiring. Why is PA sending you a new starter wire?
If you have a single wire stock (old school) Ford starter, they also sell a high torque version of that one, which is much easier to replace and no wiring involved. If you have a piggy-backed solenoid starter, it should be straight forward as well. Just replace the starter and re-connect them at the starter.
If you're changing from a single wire to remote solenoid type starter, that's where you have wiring to do.
Ok, partial success! So far this morning I’ve:
1. disconnected - side of battery;
2. removed old starter (that top bolt was fun to get to!);
3. removed old wire and run the supplied red wire from fuse box, piggy-backing it along the old wire/casing to the starter location.
My questions are these:
1. I get that the small black wire goes to the smallest post on the new starter (I’ll have to clip it and clamp on a connector), but where do the 2 remaining wires go? Does it matter? There’s one post that has a black wire that feeds into the cylinder and another post that just has 2 nuts on it.
Which one does the red wire supplied by PA Performance go on?
How many wires did your old starter have? One big red (Bat +) and a small one that slipped on a spade terminal?
Did your old one look like the new one? Was the "supplied" wire the same as the old wire you took off?
Do you still have a 4ga wire from the battery to power the starter?
Your picture of the battery cable, black solenoid lead and whatever the red wire with crimp end is suspect to what you're doing.