simpson8

Hello. Has anyone ever repinned an ecm 555 connector? Reason for this is because of an intermittent problem will be solved. Socket 19 on the A connector on the 555 ecm has a loose connection or socket causing the fuel pump relay not to run when in start position and sporadic rpm drops now and again. This is the green wire that come from the fuel pump relay coil side and is toggled to negative by 555 ecm to energize fuel pump relay coil. I see mercruiser sells a depinning tool. I have a 2004 boat with twin engines. I can see these loose sockets in plugs that fit on the ecm pins become problems later on and can easily be misdiagnosed as a faulty ecm or other parts needlessly being changed out. What you guys think?

zz28zz

Never re-pinned a 555 connector but I've done it on automotive ECMs and other equip. Finding the correct replacement pin/s will be the tricky part. Also, you'll need a special crimping tool for new pin/s in addition to the de-pinning tool (pin-pusher). One issue you may run into (if you rpl just one pin), is one wire will be shorter than the rest so it may constantly have pressure on it which will lead to another failure. Depends on the specific installation/ routing of the harness.
A couple ways to get around that, but what I found was the quickest/easiest way was to find another (used) harness and steal the pin you want along with enough wire to splice into your existing harness at a convenient location. The extra harness will come in handy for practiceing pin removal/insertion and provides lots of additional hard to find connectors for future projects/repairs.

The other option (to make all the wires the same length) is to re-pin the entire connector and hope you don't screw one up.

Gary Blydenburgh

Does anyone knw where I can get the female pins that go into the ecm 555 plug, I have a broken one and the tools to do it , just need the pins

PA.WOODCHUCK

try here
Boats Unlimited | Marine Technician Service | Inspections (boatunlimited.com)

KWright

I have a harness I've been using for pieces. Let me check it tomorrow for that connector. If I have it you can dm me your address and I'll mail it to you.

KWright

I do have that wire if you want it.

92nsx

If you can figure out what what the name of the pin, or part number. I can bet that https://www.mouser.com/ has it. It is where I ordered my replacement pins and connectors form for my MEFI3 harness