Hey all,

How difficult is it to swap over the engine wiring loom?

TIA

4 minutes ago, h1ghlander77 said:

Hey all,

How difficult is it to swap over the engine wiring loom?

TIA

Have a look at this to give you a flavour - and that's with a vintage car LOL

 

41 minutes ago, h1ghlander77 said:

swap over the engine wiring loom?

Why would you want too ?

It's a crazy amount of work with so many potential problems. It can of course be done but have you explored other options first ?

18 minutes ago, unofix said:

Why would you want too ?

It's a crazy amount of work with so many potential problems. It can of course be done but have you explored other options first ?

It’s all because of the washer pump leaking water into the Bcm. I could only get the plug for the pump and the 2 connectors for the Bcm by purchasing a loom.

4 minutes ago, h1ghlander77 said:

It’s all because of the washer pump leaking water into the Bcm. I could only get the plug for the pump and the 2 connectors for the Bcm by purchasing a loom.

Unofix will be back shortly, but that sure sounds much more simple than replacing a full engine loom 🤣

10 minutes ago, StephenFord said:

Unofix will be back shortly, but that sure sounds much more simple than replacing a full engine loom 🤣

What sounds much more simple? I’m open to ideas as I’ve ran out of ideas. Don’t want to do the replacement.

I understand about risking of introducing other issues. 

Hi Paul, firstly I just want check that you realise that the water that got in to the wiring was caused by a defective washer pump, and that it was a faulty seal inside the pump that caused the issue. I'm only saying that to clear any chance that you might be thinking rain water got in to the connector.

Once you have fitted a new pump that will be the source of the water fixed.

Now on to the harness, there are probably a few different things that can be tried before doing major full harness replacements. I've seen you photos of the washer pump plug which looks poor but probably can be saved. I'd start by cutting the washer plug off the harness about 6" (150mm) away so that you are left with just the plug and a short length of wire. Now at the other end - The BCM connector, I've not seen how good or bad things are so maybe a few pictures would help. If the connector is not too bad then strip back the insulating tape and free the wires going to the connector. Identify the wires for the screen wash pump (should be only 2) and again cut these wires about 6" from the connector. All that remains to be done now is get some 10 Amp 2 core cable and run a new length between the BCM and the pump. You can use some Gel Crimps to join the wires or normal insulated crimps and cover with adhesive lined heatshrink  to make them waterproof.

The connector pins should be cleaned up using a fibre glass pen and then covered with dialectic gel (or Vaseline) to protect against further corrosion. Let me know if there are any points in this suggestion that maybe won't work for you and I will have a rethink.

2 minutes ago, unofix said:

Hi Paul, firstly I just want check that you realise that the water that got in to the wiring was caused by a defective washer pump, and that it was a faulty seal inside the pump that caused the issue. I'm only saying that to clear any chance that you might be thinking rain water got in to the connector.

Once you have fitted a new pump that will be the source of the water fixed.

Now on to the harness, there are probably a few different things that can be tried before doing major full harness replacements. I've seen you photos of the washer pump plug which looks poor but probably can be saved. I'd start by cutting the washer plug off the harness about 6" (150mm) away so that you are left with just the plug and a short length of wire. Now at the other end - The BCM connector, I've not seen how good or bad things are so maybe a few pictures would help. If the connector is not too bad then strip back the insulating tape and free the wires going to the connector. Identify the wires for the screen wash pump (should be only 2) and again cut these wires about 6" from the connector. All that remains to be done now is get some 10 Amp 2 core cable and run a new length between the BCM and the pump. You can use some Gel Crimps to join the wires or normal insulated crimps and cover with adhesive lined heatshrink  to make them waterproof.

The connector pins should be cleaned up using a fibre glass pen and then covered with dialectic gel (or Vaseline) to protect against further corrosion. Let me know if there are any points in this suggestion that maybe won't work for you and I will have a rethink.

Thank you for the info, I’m aware that it’s screenwash and not rain water getting in.

I’ve been thinking about as you suggested, cut the old washer plug off and connect the one from the donor loom. Also thought about just doing the same to the Bcm connector blocks as well.

I’ve been told that water can still sit in the wiring even if I do the replacement, thus the same thing happening. Is that possible?

I’ve ordered a new washer pump obviously and planed to add sealant on the washer pump plug.

Hi Paul, if you have a donor harness then it would be a good idea to use the screen wash pump connector from that and connect to some new 2 core cable. That then brings you to the BCM, if you cut and join to the last 6" of wire there is a small chance of water being trapped in that but if you put the cut end of the cable into some dry salt and leave overnight it will draw out any moisture. Then strip and clean the end of the wire with IPA or similar (even WD40 works) before making the new joint.

I have done bigger and repairs on cables with more damage than your car on board Oil Rig supply ships and trust me when the Lloyds insurance inspector checks for safety they look at every possible angle for potential failure.

Spend the time to clean and prepare all the wires and make the joints tight and cover with waterproof heatshrink and I don't see why you would have further problems.

3 minutes ago, unofix said:

Hi Paul, if you have a donor harness then it would be a good idea to use the screen wash pump connector from that and connect to some new 2 core cable. That then brings you to the BCM, if you cut and join to the last 6" of wire there is a small chance of water being trapped in that but if you put the cut end of the cable into some dry salt and leave overnight it will draw out any moisture. Then strip and clean the end of the wire with IPA or similar (even WD40 works) before making the new joint.

I have done bigger and repairs on cables with more damage than your car on board Oil Rig supply ships and trust me when the Lloyds insurance inspector checks for safety they look at every possible angle for potential failure.

Spend the time to clean and prepare all the wires and make the joints tight and cover with waterproof heatshrink and I don't see why you would have further problems.

Thank you very much for the advice. Think I’ll go down the splicing root instead of replacing the entire loom 

Could I just run new 2 core wire to the Bcm connector and splice the new wiring on the connector obviously using the new 2 core wire instead of the water logged wiring?

 

if so what are the pins that link to the connector to the washer plug?

 Thanks 

1 minute ago, h1ghlander77 said:

Thank you very much for the advice. Think I’ll go down the splicing root instead of replacing the entire loom 

See? That's what I meant when I said potentially more 'simple' 🤣 and I knew Unofix would sort you out...

5 minutes ago, StephenFord said:

See? That's what I meant when I said potentially more 'simple' 🤣 and I knew Unofix would sort you out...

😂🤣😂 fair enough and thank you.

what are the pins the washer bottle connects to in the Bcm connector?

also 2 gauge wire. Anything particular I need to watch out for or is 2 gauge wire, just 2 gauge wire? 

Hi Phil, I know this cable is normally used for household appliances but it will be just fine for your screen wash pump.

https://www.screwfix.com/p/time-2192y-black-2-core-0-75mm-flexible-cable-10m-coil/150JY?tc=TA3&ds_kid=92700055281954475&ds_rl=1249401&gclid=Cj0KCQiAkNiMBhCxARIsAIDDKNVNOtzpbBhi0WRAKV5arlgA21UHC6HeNBhY5SsiuDcx4fJmgsTNcnMaAn2tEALw_wcB&gclsrc=aw.ds

I don't know the pins on the BCM connector but with a multimeter you can find them easy. Just connect the meter to one of the wires on the pump and do a continuity check on each of the pins of the BCM until you come to one thats less then a couple of ohms. Make a note of that wire, then do the same for the other pump wire. When you feel that you have found them both on the BCM plug then go to the wires at the pump end and short then together. Come back to the BCM and check the two wires that you think are for the pump. If you are correct then they will be short-circuit confirming that they are the correct wires for the pump.

51 minutes ago, unofix said:

Hi Phil, I know this cable is normally used for household appliances but it will be just fine for your screen wash pump.

https://www.screwfix.com/p/time-2192y-black-2-core-0-75mm-flexible-cable-10m-coil/150JY?tc=TA3&ds_kid=92700055281954475&ds_rl=1249401&gclid=Cj0KCQiAkNiMBhCxARIsAIDDKNVNOtzpbBhi0WRAKV5arlgA21UHC6HeNBhY5SsiuDcx4fJmgsTNcnMaAn2tEALw_wcB&gclsrc=aw.ds

I don't know the pins on the BCM connector but with a multimeter you can find them easy. Just connect the meter to one of the wires on the pump and do a continuity check on each of the pins of the BCM until you come to one thats less then a couple of ohms. Make a note of that wire, then do the same for the other pump wire. When you feel that you have found them both on the BCM plug then go to the wires at the pump end and short then together. Come back to the BCM and check the two wires that you think are for the pump. If you are correct then they will be short-circuit confirming that they are the correct wires for the pump.

Thank you, appreciate your help. Thank god you were about lol 

Just overlay the new circuit.