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  1. #1
    Gold Member
    Join Date
    Dec 2004
    Posts
    374
    Location
    Davidsonville, Maryland
    Tractor
    John Deere 4400, '48 B and 318

    Default 7 pin connector corroded?

    OK, on every trailer I've owned (two....) pins five and six (left and right turn signal) connector pins on the trailer ALWAYS get corroded, even though they don't get wet. What the heck?

    What are the chances the onboard trailer battery is causing some kind of galvanic action to cause the corrosian? As of now I'm disconnecting the 12V battery when the trailer is not in use, this problem comes up once a year....

    Is it just me or does anyone else run into this?

    Wayne

  2. #2
    Silver Member rkeith's Avatar
    Join Date
    Aug 2011
    Posts
    170
    Location
    Prattville, AL
    Tractor
    GC1720 TLB

    Default Re: 7 pin connector corroded?

    Probably moisture from the roadway. I used to have that problem but I solved it by using a conductive gel from Advanced Auto and put it on the trailer connection so when I plug it in it puts the gel right where it needs to be! It is conductive so I only put a dab on each of the 7 pins. Seems to work great!
    Robert

    GC1720 TLB

    Take-offs are optional but landings are mandatory!
    Blood goes round and round; air goes in and out. Any deviation of these two is a problem!

  3. #3
    Platinum Member High Compression's Avatar
    Join Date
    Aug 2010
    Posts
    562
    Location
    De Soto, KS
    Tractor
    Kubota L5740-3/ Kubota ZD21 pro60

    Default Re: 7 pin connector corroded?

    Quote Originally Posted by Wayne_H View Post
    OK, on every trailer I've owned (two....) pins five and six (left and right turn signal) connector pins on the trailer ALWAYS get corroded, even though they don't get wet. What the heck?

    What are the chances the onboard trailer battery is causing some kind of galvanic action to cause the corrosian? As of now I'm disconnecting the 12V battery when the trailer is not in use, this problem comes up once a year....

    Is it just me or does anyone else run into this?

    Wayne
    I always have the same problem. Less on the 7 ways, more so on 6 ways. Matter of fact I've converted all 10 of my trailers to 7 ways. A little dielectric grease helps, and what position your plug is stored in, I have found, makes a difference of how much rain gets into it.
    "It is better to be thought a fool, than to open your mouth and prove it."

  4. #4
    Super Star Member Diamondpilot's Avatar
    Join Date
    Jan 2007
    Posts
    14,608
    Location
    Daleville, IN
    Tractor
    Jinma 254/284 Ford 861 Powermaster at work

    Default Re: 7 pin connector corroded?

    Put dielectric grease one then plugs and that will end you problems.

    You must clean them up first.

    Chris

  5. #5
    Veteran Member
    Join Date
    Dec 2009
    Posts
    1,340
    Location
    Kansas...USA
    Tractor
    Kubota B2620 (2012)

    Default Re: 7 pin connector corroded?

    This is my experience on a 6 (?) pin trailer. Even new it made poor connection. I figured it was corrosion and used a battery terminal wire brush to shine it up. But later I noticed that the connection would always work if the sag in the connection was lifted with a zip tie or cord to hold the line up. A hole in the bumper where the spare tire jack-rod was a handy to place to tie it "up". Cheers. Mike
    Kubota B2620 HST

  6. #6
    Gold Member
    Join Date
    Dec 2004
    Posts
    374
    Location
    Davidsonville, Maryland
    Tractor
    John Deere 4400, '48 B and 318

    Default Re: 7 pin connector corroded?

    Guys: I have tried the dielectric grease route, I really don't see much difference with that.

    But, these connectors have seven pins.... why is there corrosion only on the two pins used for the left and right signal (and brake lights)? That is some kind of clue, the metal does not turn green on its own (at least the other five pins don't...)

    Just fishing for ideas, I always keep it dry and it does not get moisture in the connector.

    regards

    Wayne

  7. #7
    Super Star Member Egon's Avatar
    Join Date
    Aug 2001
    Posts
    17,769
    Location
    Nova Scotia, Canada

    Default Re: 7 pin connector corroded?

    What do you use to protect from road spray and humidty in the air?
    Egon
    50 years behind the times
    Livin in a
    Worn out skin bag filled with rattlin bones

  8. #8
    Veteran Member moored4's Avatar
    Join Date
    Jan 2011
    Posts
    2,368
    Location
    Great NorthWest /Southwest Washington
    Tractor
    Kubota l245dt, l3540, 8N

    Default Re: 7 pin connector corroded?

    Have you disconnected the plug and then checked it with a ohms meter to see if there is any stray current present? With everything shut off there should not be any current except on the positive battery supply line.
    "keep them pots black, shiny, and full of good Food and Fellowship!"
    Moore Cookie

  9. #9
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    48,758
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: 7 pin connector corroded?

    i pack my connectors with grease unde rthe caps..

    soundguy

  10. #10
    Silver Member
    Join Date
    Aug 2010
    Posts
    130
    Location
    Ontario
    Tractor
    John Deere 68, Honda H3011H

    Default Re: 7 pin connector corroded?

    Quote Originally Posted by Wayne_H View Post
    Guys: I have tried the dielectric grease route, I really don't see much difference with that.

    But, these connectors have seven pins.... why is there corrosion only on the two pins used for the left and right signal (and brake lights)? That is some kind of clue, the metal does not turn green on its own (at least the other five pins don't...)

    Just fishing for ideas, I always keep it dry and it does not get moisture in the connector.

    regards

    Wayne
    My guess would be that those two circuits see the highest current and a much higher number of "on" and "off" cycles. If the contact pressure between the male and female terminals is not adequate, it would be just like switch contacts arcing. What I would do is thoroughly clean the terminals inside and out with steel wool and spread the male terminals a bit with a knife blade. This will increase the contact pressure. Then, coat the terminals with dielectric grease to make it easier to insert the plug with the spread terminals and also keep out moisture. What someone else said earlier about supporting the connector also makes sense, because that would reduce vibration "fretting" the terminals.

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