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Old 05-30-2017, 08:14 AM   #1
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Round 4 pin connectors, are there 2 types?

I got my toad setup with a round 4 pin plug and we have a nice cable that fits it, but the connector on the back of the MH seems to be just slightly larger.

The MH connector is labeled Pollack and I guess is heavier duty. So what's should I change? I have a larger 7-pin I could use also. Do I cut the cut the existing 4-regular male to 4-regular male pin cable and change one end to either 4-pin heavy duty or 7 pin male. Or change the MH 4 pin heavy duty female plug to a regular duty plug?
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Old 05-30-2017, 11:08 AM   #2
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I'd leave the plug on the coach alone and splice on a new plug to your patch cord between your car the coach.
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Old 05-30-2017, 11:30 AM   #3
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I think you are right. Assuming that the plug end below fits the MH end, cutting the patch cable should be the cleanest and easiest.

Pollak Heavy-Duty, 4-Pole, Round Pin Trailer Wiring Connector
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Old 05-30-2017, 11:44 AM   #4
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The industry, both RV's and trucks use the seven pin connector as a standard connector. For that reason, all of my connectors have the seven pin on the coach/truck side and then use whatever you want on the toad side or trailer. This ensures continuity across other tow vehicles.

So......change the RV side of your umbilical to the seven pin and then use your current setup on the toad end.
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Old 05-30-2017, 12:22 PM   #5
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Good point. Future proofing for the next MH.
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Old 05-30-2017, 07:53 PM   #6
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i use 7 at coach side and 7 at toad side, for i need 5 pins, one for battery charge and four for combined signals.
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