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Topic: Fuse Link P on 5.0L engine only (Read 1884 times) previous topic - next topic

Fuse Link P on 5.0L engine only

ON the 5.0 body harness inside the engine bay up near the master cyl there is a blue fuse link.
this is considered fuse link P.

within the EVTM on the start ckt diagrams you can compare the 3.8L to the 5.0.

On the 5.0L i have no clue what purpose this link serves so any advice or input is helpful as i am grafting a 5.0 body harness to a 3.8 body harness.

all i see is a pointless parallel set of paths, one path being useful on the brn/pk, but this fuse link P i have no idea what its trying to accomplish.

Fuse Link P on 5.0L engine only

Reply #1 –
Some of the fuseable links are ran in parallel. I couldnt track that one down either. I think it has the do with the eec relay, but im not sure. I checked it to make sure I was getting power when my fuel pump quit.
Quote from: jcassity
I honestly dont think you could exceed the cost of a new car buy installing new *stock* parts everywhere in your coug our tbird. Its just plain impossible. You could revamp the entire drivetrain/engine/suspenstion and still come out ahead.
Hooligans! 
1988 Crown Vic wagon. 120K California car. Wifes grocery getter. (junked)
1987 Ford Thunderbird LX. 5.0. s.o., sn-95 t-5 and an f-150 clutch. Driven daily and going strong.
1986 cougar.
lilsammywasapunkrocker@yahoo.com

Fuse Link P on 5.0L engine only

Reply #2 –
Quote from: Haystack;457682
Some of the fuseable links are ran in parallel. I couldnt track that one down either. I think it has the do with the eec relay, but im not sure. I checked it to make sure I was getting power when my fuel pump quit.


its location is in the body harness wire loom up beside the master cyl

Fuse Link P on 5.0L engine only

Reply #3 –
Looks to me like either the drawing is screwed up or they screwed up where they installed the fuse link.
The way it is shown doesn't serve any useful function as a fuse link, as far as I can see.

87 is the first year they put a fuse link in that circuit.

If you look at the 88 EVTM you will see how it should be in the circuit. The 88 EVTM says the splices for it are near the fuse panel. So the 87 & 88 harnesses are different.

Looking at the 87 EVTM for the 2.3, looks like they got it right.

Fuse Link P on 5.0L engine only

Reply #4 –
Quote from: softtouch;457689

Looking at the 87 EVTM for the 2.3, looks like they got it right.


thats what i thought also but i did not want to assume that fuse link p in th 2.3L served the same purpose as the 5.0.

fuse link p is non-existent in the 87 year 3.8L (CFI)

I am going to sketch the ckt out the way its resides in the wire loom and see if it matches the drawing.. and if it does then we agree.

if it does not then another probable fault is the fuse link is incorrectly drawn in the diagrams as to its function, meaining it might be correctly installed and incorrectly illustrated. 

i'll update here later today

Fuse Link P on 5.0L engine only

Reply #5 –
page 43 on 87evtm for the 5.0L calls it "fuse link P"

page 44 on 88evtm for the 5.0L calls it "fuse link D"

both ckt numbers stayed the same across the 87 & 88 evtm(s) yet the name of the same fuse link changed

16- rd/lg Ign Sw "Run"

&

262 brn/pk Ign Sw "Start"

Fuse Link P on 5.0L engine only

Reply #6 –
apparently Chance my youngest son mentioned something that makes sense.
He thinks that fuse link P is there so when you are in a situation when troubleshooing the start ckt, you can disconnect the parallel conneciton "C312" and still keep the circuit in play / powered up but in a safe manner by way of the fuse link.

interesting theory,  think i can buy it.