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Old 07-05-2016, 12:12   #16
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Re: to grease or not to grease?

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Originally Posted by capt-couillon View Post
Boy am I gonna get a load of grief for this one
Myself I do not trust, and do not use straight crimp connections for high current connections such as starter or windless circuits. It has been my observation and experience that crimp only connections in a marine environment degrade quickly due to internal oxidation, leading to high resistance and the associated increase in temperature.

My standard method for making up a high current terminal is to tin the wire (if not already tinned), tin the interior of the crimp on connector, coat both components with a light covering of rosin based flux. Slide a 3-4" piece of heat shrink over the wire (well back from the joint) and lightly crimp the connector in place making sure you have a half inch or so of bare wire between the connector and the wire insulation. Lightly clamp a pair of vice-grips on the exposed wire to act as a heat sink.

Get out the propane torch and a spool of 60/40 rosin core solder. Heat the connector until the solder melts when you touch the exposed wire in front of your heat sink (not when you touch it to the connector). Flood the connector cavity with solder till full. When it cools, slide the heat shrink down over the insulation and connector cavity and shrink into place.

Takes a few minutes, but no air, no water, and in 40 years of doing it this way, no failed connections.

Let the rants begin

Oh, and a bit of Lanocoat smeared on the connections after you make them up to the windless solenoid will keep them from "greening up" as well.

Your mileage may vary
I don't see why you would get grief. If it were 22AWG yes . A sound recommendation.
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Old 07-05-2016, 14:10   #17
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Re: To Grease Or Not To Grease?

Sounds great & I intended to do that bar the grease.
Too many lugs, too little time.
And an antsy neighbour complaining about " me working on my boat in a marina".
Guess I just have to mega them regularly.
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Old 07-05-2016, 15:37   #18
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Re: To Grease Or Not To Grease?

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Sounds great & I intended to do that bar the grease.
Too many lugs, too little time.
And an antsy neighbour complaining about " me working on my boat in a marina".
Guess I just have to mega them regularly.
Wow, lateral,

Exactly where does the neighbour think you should work on your boat? Or, is this some kind of "Royal" club where there are a lot of no-no's? Or, is the neighbour the kind of fellow/gal who always complains about SOMEthing?

Sorry, but I think the neighbor's fuss is really OTT, unless you're disturbing their sleep or something like that. What do they care?

Ann
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Old 07-05-2016, 15:52   #19
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Re: To Grease Or Not To Grease?

Apparently he does it with every newcomer.

Maybe he failed police entry requirements and feels unfulfilled?

Management knew it was a WIP. And, I have adhered to the "no welding /grinding".

Work dock for that.
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Old 07-05-2016, 19:39   #20
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Re: To Grease Or Not To Grease?

Spot on Captain!! Never fails!! I also use Tectyl spray around all electrics to prevent salt ingress, Great stuff
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Old 07-05-2016, 19:56   #21
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Re: To Grease Or Not To Grease?

Dielectric grease before crimping is A-OK. The mechanical crimping action will force the grease out of the contact leaving a metal to metal connection surrounded by insulating grease. A lot of people don't understand that and only recommend dielectric after the joint but for best results coat terminal and wire in dielectric before crimping.

Note solder is different- no dielectric prior to joint. That being said I had a solder joint fail the other day. 74 Pearson, original engine room blower switch. High resistance short, blower switch got too hot to touch, and solder wire connection melted off the back of the switch.

Thankfully it was easily accessible and we were in mostly calm conditions - seas 3-5' winds 12-15kt. Yes it lasted 40+ years but the failure could've been nasty. I like solder joints for most things - but not on boats.
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Old 07-05-2016, 20:00   #22
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Re: To Grease Or Not To Grease?

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Originally Posted by Whitebread117 View Post
Dielectric grease before crimping is A-OK. The mechanical crimping action will force the grease out of the contact leaving a metal to metal connection surrounded by insulating grease. A lot of people don't understand that and only recommend dielectric after the joint but for best results coat terminal and wire in dielectric before crimping.
Thank you for that clear description.
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Old 08-05-2016, 00:18   #23
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Re: To Grease Or Not To Grease?

I solder everything, 16 gauge to 00, no failures, I don't trust crimps alone.
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Old 09-05-2016, 03:31   #24
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Re: To Grease Or Not To Grease?


I've been making high grade crimped connections for industry for 30 years and call tell you for sure that there is a huge difference in quality (and cost) between the high end crimpers and the cheap ones that almost all non-commercial people have. Cheap crimped connections are inferior.


Solder is a very good connection on sailboats.[/QUOTE]

Thanks for the input
I would be interested to know what make(s) of crimpers and and terminals you would recommend. Nothing like drawing on experience!

Thanks
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Old 09-05-2016, 06:27   #25
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Re: To Grease Or Not To Grease?

Our installation manual specifically mentioned using CRC Heavy Duty Corrosion Inhibitor or similar once the connections were made. It also recommends spraying the motor casing and such. Because these wires are some of the most likely wires to come in contact with the elements they also ask that you disassemble yearly, clean, and respray with corrosion inhibitor. I can't see why dielectric grease would not be equally effective - as long as the product used can't get washed away.

I follow a similar method of crimping as mentioned above.
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