Relays and Diodes
Thread Starter
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Mountain Pass
Joined: Dec 2017
Posts: 130
Likes: 21
From: Lebanon, TN
Relays and Diodes
1996 F 250 PS. I recently had a no start issue, WTS light would not come on. According to the flow chart I checked the fuses, which were good. I finally swapped some relays in the power distribution box and the truck started.
I would like to keep spare fuses and relays to avoid being stranded somewhere in the future, and I can source those items online.
There is a PCM Diode in the box that appears to be in the same circuit. I would like to keep a spare one but according to Ford it is obsolete, and I can’t find one anywhere.
It is a diode, so it can’t be complicated. Has anyone replaced this part, and what did you use?
Thanks.
I would like to keep spare fuses and relays to avoid being stranded somewhere in the future, and I can source those items online.
There is a PCM Diode in the box that appears to be in the same circuit. I would like to keep a spare one but according to Ford it is obsolete, and I can’t find one anywhere.
It is a diode, so it can’t be complicated. Has anyone replaced this part, and what did you use?
Thanks.
Thread Starter
|
Mountain Pass
Joined: Dec 2017
Posts: 130
Likes: 21
From: Lebanon, TN
Thread bump.
I know turbos and h pops are more popular, but I am sure there are some folks that are electronics knowledgeable out there.
Have you had to replace the PCM diode in the power distribution box, and if so what did you use? The part number on mine is
F2TF 14A604 AA. (Obsolete). According to the manual it has something to do with the power train control system relay coil.
Maybe it’s not something that fails, or it’s not critical?
Thanks again.
I know turbos and h pops are more popular, but I am sure there are some folks that are electronics knowledgeable out there.
Have you had to replace the PCM diode in the power distribution box, and if so what did you use? The part number on mine is
F2TF 14A604 AA. (Obsolete). According to the manual it has something to do with the power train control system relay coil.
Maybe it’s not something that fails, or it’s not critical?
Thanks again.
Mountain Pass
Joined: Jan 2020
Posts: 210
Likes: 90
From: Troy, MT
Found one for later model Mustangs on fleabay, item # 194412866050.
Suppose it's to prevent backfeeding a relay circuit. A 1n4001 diode might work?
If you look at that fleabay you see the diode has a notch in it for polarity.
Suppose it's to prevent backfeeding a relay circuit. A 1n4001 diode might work?
If you look at that fleabay you see the diode has a notch in it for polarity.
Thread Starter
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Mountain Pass
Joined: Dec 2017
Posts: 130
Likes: 21
From: Lebanon, TN
Thanks for the reply. The part number is different. Mine is more of a maxi size with the blades at 90 degrees to each other.
I have seen a picture of that Amazon part number on a different site and it looks different than mine.
I have seen a picture of that Amazon part number on a different site and it looks different than mine.
Mountain Pass
Joined: Jan 2020
Posts: 210
Likes: 90
From: Troy, MT
Now that we know it is larger, it could be a higher amp diode like a 1N5401, which is 100V 3A. !N5402 is 200V, and so on up to 1000V.
Last edited by 96XLTczny; Jul 1, 2024 at 04:52 PM. Reason: New info from PO
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Lead Driver
Joined: Sep 2002
Posts: 9,539
Likes: 2,030
From: North Texas
What is issue with identification of old/bad diode and just swapping it? Just count the rings and colors.
Think of it like a hose bib, only allows flow one way.
Think of it like a hose bib, only allows flow one way.
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Mountain Pass
Joined: Jan 2020
Posts: 210
Likes: 90
From: Troy, MT
10 pack of 1N5401 diodes are $5.50 on Amazon. Bend the leads to match spacing, cut leads just long enough, crimp & solder 2 spades to the wire leads at right angles oriented with stripe to left like the diode on that part. Pot it in epoxy if you like. Done.
For decades color codes were used on capacitors, inductors and are still used on some resistors. Most everything today is SMT, surface mount technology.
Some of the older germanium diodes did have color coding. Not so much the silicon diodes.
As an SWL electronics hobbyist, I learned to read color codes in the sixties as a teenager.
For decades color codes were used on capacitors, inductors and are still used on some resistors. Most everything today is SMT, surface mount technology.
Some of the older germanium diodes did have color coding. Not so much the silicon diodes.
As an SWL electronics hobbyist, I learned to read color codes in the sixties as a teenager.
Thread Starter
|
Mountain Pass
Joined: Dec 2017
Posts: 130
Likes: 21
From: Lebanon, TN
10 pack of 1N5401 diodes are $5.50 on Amazon. Bend the leads to match spacing, cut leads just long enough, crimp & solder 2 spades to the wire leads at right angles oriented with stripe to left like the diode on that part. Pot it in epoxy if you like. Done.
For decades color codes were used on capacitors, inductors and are still used on some resistors. Most everything today is SMT, surface mount technology.
Some of the older germanium diodes did have color coding. Not so much the silicon diodes.
As an SWL electronics hobbyist, I learned to read color codes in the sixties as a teenager.
For decades color codes were used on capacitors, inductors and are still used on some resistors. Most everything today is SMT, surface mount technology.
Some of the older germanium diodes did have color coding. Not so much the silicon diodes.
As an SWL electronics hobbyist, I learned to read color codes in the sixties as a teenager.
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