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Does anyone put heat shrink tubing over a connector plug? #5397910 04/08/20 10:39 PM
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motor_oil_madman Offline OP
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Say a main wiring harness plug where it has those plastic connectors that connect all the individual wires together. Anyone ever unplug the connector then slide the heat shrink tubing over and then shrink it down after connecting back together? I haven't looked to see how large of a diameter they make heat shrink tubing though. I have a wiring harness plug on my lawn mower that gets wet everytime it rains and i'm surprised after 5 years it hasn't started causing an issue yet. I want to make this connector water proof.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Does anyone put heat shrink tubing over a connector plug? [Re: motor_oil_madman] #5397913 04/08/20 10:42 PM
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UG_Passat Online Content
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Certain connectors have a gasket inside along with plugs for the wire itself, to make it waterproof.


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Re: Does anyone put heat shrink tubing over a connector plug? [Re: motor_oil_madman] #5397918 04/08/20 10:44 PM
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oldhp Offline
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I guess you could. The mower sits outside? I'd fill the plug ends with die-electric grease and before I shrunk the tubing down.


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Re: Does anyone put heat shrink tubing over a connector plug? [Re: UG_Passat] #5397945 04/08/20 11:21 PM
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motor_oil_madman Offline OP
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Originally Posted by UG_Passat
Certain connectors have a gasket inside along with plugs for the wire itself, to make it waterproof.



I don't think that is the case with this particular connector.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Does anyone put heat shrink tubing over a connector plug? [Re: oldhp] #5397946 04/08/20 11:22 PM
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Originally Posted by oldhp
I guess you could. The mower sits outside? I'd fill the plug ends with die-electric grease and before I shrunk the tubing down.


The mower is used commercially, so whenever it rains it's going to get wet.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: Does anyone put heat shrink tubing over a connector plug? [Re: motor_oil_madman] #5397979 04/09/20 01:46 AM
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I do in certain applications...

Re: Does anyone put heat shrink tubing over a connector plug? [Re: motor_oil_madman] #5397995 04/09/20 03:52 AM
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You could always swap that connector out for a waterproof model. Not the easiest thing ever, but far from super difficult.

The problem with heat shrink is, depending on the size of the connector and wires, you'll probably not get one that will shrink down enough to seal against the wires. If you can't seal the backside of the connector, there's no sense in sealing the middle really.


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Re: Does anyone put heat shrink tubing over a connector plug? [Re: motor_oil_madman] #5398025 04/09/20 06:39 AM
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tcp71 Offline
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Heat shrink tubing with a 3:1 shrink ratio and adhesive lined. Make sure it extends well beyond the connector on each side. You can seal each end by pinching extra tubing with plyers while it’s hot.

https://www.mcmaster.com/heat-shrink-tubing/extra-thick-moisture-seal-heat-shrink-tubing/

Last edited by tcp71; 04/09/20 06:41 AM.

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Re: Does anyone put heat shrink tubing over a connector plug? [Re: motor_oil_madman] #5398029 04/09/20 06:45 AM
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Donald Offline
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Originally Posted by motor_oil_madman
Say a main wiring harness plug where it has those plastic connectors that connect all the individual wires together. Anyone ever unplug the connector then slide the heat shrink tubing over and then shrink it down after connecting back together? I haven't looked to see how large of a diameter they make heat shrink tubing though. I have a wiring harness plug on my lawn mower that gets wet everytime it rains and i'm surprised after 5 years it hasn't started causing an issue yet. I want to make this connector water proof.


I often use liquid tape.


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Re: Does anyone put heat shrink tubing over a connector plug? [Re: motor_oil_madman] #5398044 04/09/20 07:05 AM
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if you apply heat shrink will end the end the heat shrink be out of the rain? where the heat shrink ends on a bundle of wires will not be waterproof, any water that does get in will have a much harder time drying.


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Re: Does anyone put heat shrink tubing over a connector plug? [Re: motor_oil_madman] #5398053 04/09/20 07:30 AM
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I do sometimes when i make any electrical repair on my car.

If the connectors are large, you can use 2 different sizes of tubing. Use 3 pieces, the largest on the middle (for the connectors) and then you can use the 2 small pieces of tubing, to seal the ends on each side of the large one you used for the connector.

You can also use dielectric Grease around the connectors.


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Re: Does anyone put heat shrink tubing over a connector plug? [Re: motor_oil_madman] #5398059 04/09/20 07:35 AM
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Harbor fright sell self vulcanizing tape, it welds into an continuous piece. Only sticks to itself. It is soft and easy to remove. Forms of this are used on military applications so it is proven. Like 5 bucks a roll. Seperate connector, clean off all corrosion. Pack cavity with die-electric silicone. Then wrap with tape.

Rod

Re: Does anyone put heat shrink tubing over a connector plug? [Re: motor_oil_madman] #5398113 04/09/20 08:35 AM
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LIMITED EXPERIENCE....with some of it VERY heavy duty.

A neighbor showed me CRC 5-56. He used it on his tractor's connections...I use it on mine.

Re: Does anyone put heat shrink tubing over a connector plug? [Re: oldhp] #5398224 04/09/20 09:47 AM
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OldSparks Offline
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Originally Posted by oldhp
I guess you could. The mower sits outside? I'd fill the plug ends with die-electric grease and before I shrunk the tubing down.


Winner, winner, chicken dinner! Good read here on dielectric grease, if you have the time...

https://www.w8ji.com/dielectric_grease_vs_conductive_grease.htm

Last edited by OldSparks; 04/09/20 09:48 AM.
Re: Does anyone put heat shrink tubing over a connector plug? [Re: motor_oil_madman] #5398260 04/09/20 10:07 AM
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ARCOgraphite Offline
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Weather pack connector don't need any help.

I do worry about GND eyelets rotting off frame and body and engine block - due to galvanic action.

For some of our exposed stuff, we put a paraffin wax

I would not use Silicone or RTV other than spray it yearly with "Wire Dry"

Last edited by ARCOgraphite; 04/09/20 10:10 AM.

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