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Old 09-03-2005, 11:43 PM
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Default Help with Jack Plate repair

I have CMC jack plate on a 23' Ranger Bay. It quit working today, and traced the problem to a bad relay and/or wiring harness. As you would expect, I found visible corrosion. I isolated and tested the lift motor, and it is good. The relays still "click" when I hit the switch. When I switched the up and down relays, the motor still would not function. Given all this, I am sure the wiring harness is bad. I need to cut the old one out and install a new one. There are MANY wires that tie in to this thing, so I don't know if I should do this myself, or let a professional do it.

I do not know the best way to splice wires to survive the saltwater environment below deck. Can someone tell me the best way to do this? Is this something I should attempt myself? Thanks so much,

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Old 09-03-2005, 11:58 PM
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Default Re: Help with Jack Plate repair

Sure you can do it yourself. On the boat trailer wiring I do. I use a crimp shrink connector, but before you do that slide a piece of shrink tubing w/ the glue in it that will be at least 1/2in longer than the butt conector.
I then crimp and shrink the butt connector, then add liquid elec. tape to the end's of that connector and then I slide the shrink tubing over the whole thing and shrink that. I've never had a come back and these connection's are submirged.
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Old 09-05-2005, 12:18 AM
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Default Re: Help with Jack Plate repair

What is the glue that you mentioned? I'm not sure I understand that step involving glue. I also have not located liquid electrical tape. Where can I buy that? I did find a 3M product designed to be brushed on over a splice that has been taped with electrical tape. I assume this is a different product?

Any others out there with marine wire splicing expertise?
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Old 09-05-2005, 12:37 AM
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Default Re: Help with Jack Plate repair

Well I'm not going to commit to the whole marine wire splicing expertise thing, but I will second warthog5's approach. Although me personally I not to big on those crip type connectors - personally I'd soldier then use a solvent to remove the flux, then the shrink tubing with glue, then liquid tape and then the rubber tape that welds itself together - hydro line men use it all the time.

Shrink tubing can be bought with glue on the inside of it or without. The glue type stuff really does add a weather resistance. The glue type shrink tubing itself is also much heavier then it's counter part - generally rubber.

The job is not a big deal to do yourself; just repair one wire at a time, then test continuity with an OHM meter to make sure the current passes through, then shrink wrap and seal. The only other comment I would pass along to you would be to mark any wire color changes you make along the way if you have any wiring diagrams.
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Old 09-07-2005, 12:36 AM
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Default Re: Help with Jack Plate repair

Hey guys, I got the wiring harness changed out tonight with no problems. I didn't get quite as elaborate as you guys with the splicing, but I am confident my technique will do the trick. That liquid electrical tape is a handy tool to have around. I finally found it at Home Depot. Thanks for the encouragement and advice.
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Old 01-20-2014, 10:08 AM
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Default Cmc jackplate problems

Instead of starting a new thread I figured I would ad on here. I have a cmc jackplate, that keeps blowing relays. When one goes it will go in one direction, depending on which relay went. Also when I take them off the bad one always has brown rusty water in it. Is water getting into them and shorting them out or is that something that happens when one blows? They are under my center console, not sure how they are getting all that moister in them.
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Old 01-20-2014, 04:17 PM
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I forgot to mention, the relays are cmc 7493.
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