Best plan of attack for 4 & 7 pin wiring? - Page 2 - Fiberglass RV


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Old 06-10-2014, 02:21 AM   #15
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Name: Dave
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Fallon, you may want to pull up etrailer on line, they have videos on just about any application you may want to do and it's cool to see how they do it. Plus their prices and shipping are great. Not sure if I would just cut wires and add on. I always like the "home run", one wire from start to finish. No slices as they are just another place for a connection to go bad. Good luck to you.
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Old 06-10-2014, 10:30 AM   #16
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Name: Fallon
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Been using etrailer for several trailer projects. I agree, definitely great diagrams & docs.

I didn't trust any of the old wire, so ripped it all out and ran fresh trustworthy wire.

Sent from my SAMSUNG-SGH-I747 using Fiberglass RV mobile app
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Old 06-10-2014, 11:01 AM   #17
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Originally Posted by Timber Wolf View Post


2. You always get some free charging time when you are driving and, if needed, you can top up the battery at a campground with the TV should it be needed (even at night). Running your TV to charge the trailer battery is the most inefficient mode possible, and would be better done with the TV turned around and running large gauge jumper cables if it is that important.



How could it possible be more efficient to leave the tug running with large jumper cables on it in order to charge your trailer battery???.... your spending money on gas and you run the risk in most parts of NA these days of getting a ticket for unnecessary idling. Not to mention the environmental emissions impact of leaving a vehicle idling to charge a trailer battery.

Seems to me it would be far more cost efficient & environmentally friendly to have the trailer battery set up to charge while you are driving to your destination. Its worked well for me for years. I had to have a charge line & a 4 pin changed to a 7 pin on my previous tug at Uhaul and it wasn't a whole lot of money as I recall.... in fact far less than one ticket for excessive idling.

One doesnt need to add the brake wire to a seven pin if there is no brakes just leave it empty. I have a 7 pin to 4 pin adapter that one simple puts on the seven pin for those occasions that I need to pull something with only a 4 pin. Works fine.
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Old 06-10-2014, 11:47 AM   #18
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Quote: "
Originally Posted by Timber Wolf
2. You always get some free charging time when you are driving and, if needed, you can top up the battery at a campground with the TV should it be needed (even at night). Running your TV to charge the trailer battery is the most inefficient mode possible, and would be better done with the TV turned around and running large gauge jumper cables if it is that important."

Yep, but sometimes ya just gotta do what ya gotta do.

I didn't mean to be topping up the battery upon arrival, but perhaps on the 3rd or 4th day of boondocking.

Down here in the lower provinces we don't have rules yet governing idle time, at least not in campgrounds. But I, for one, would rather have the person next to me idle an engine on a emissions equipped vehicle than run a generator that has no emissions devices and is almost always a lot more noisier than a vehicle. Now, if the TV is a 10 liter Diesel, all bets are off (LOL)

I think the point he was trying to make is that you can boost/charge a battery quicker with jumper cables than with the charging line, and that is correct. Of course those cables can sorta get in the way when driving down the road, even at 55 MPH.....
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Old 06-10-2014, 11:59 AM   #19
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Originally Posted by Carol H View Post
How could it possible be more efficient to leave the tug running with large jumper cables on it in order to charge your trailer battery???.... your spending money on gas and you run the risk in most parts of NA these days of getting a ticket for unnecessary idling. Not to mention the environmental emissions impact of leaving a vehicle idling to charge a trailer battery.

Seems to me it would be far more cost efficient & environmentally friendly to have the trailer battery set up to charge while you are driving to your destination. Its worked well for me for years. I had to have a charge line & a 4 pin changed to a 7 pin on my previous tug at Uhaul and it wasn't a whole lot of money as I recall.... in fact far less than one ticket for excessive idling.

One doesnt need to add the brake wire to a seven pin if there is no brakes just leave it empty. I have a 7 pin to 4 pin adapter that one simple puts on the seven pin for those occasions that I need to pull something with only a 4 pin. Works fine.
Please re-read my comment, I was NOT advocating running the TV at rest to charge the battery, in fact I think the notion is ridiculous (note my working about it being the most inefficient mode possible). I was RESPONDING to the comment about doing it, and noted that if you were going to it would be far more efficient to do it through MUCH larger wires, in this case heavy gauge jumpers. I would like to say that I seriously doubt any vehicleís factory charge wire is bigger than 12 gauge, maybe 10 at best. Somebody would have to prove to me their TV had anything larger than that running back to the plug unless that ran it themselves just for that purpose.

There are certainly advantages to a 7-pin plug, no doubt. But that should not be the end of the discussion nor assumed to even be a suitable answer to charging the trailerís battery. There are other possibly far more efficient and effective methods of charging. The assumption seems to be that charging the battery while driving is free and that it is doing a good job of charging. It may indeed be very low cost but may not actually be doing much in the way of charging. Most of us will never know because we do not test the capabilities of our systems and assume we got some/enough charge. We just assume or accept that stuff (like batteries) goes bad occasionally and it was not a fault of under or over charging or maintenance. What I advocate is a serious study of the individualís situation, and based on the OPís statement about boondocking I believe a solar system might be the best choice.
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Old 06-10-2014, 12:07 PM   #20
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Originally Posted by Fallon View Post
I was hoping to keep it universal with a 7 pin & 4 pin, so whoever borrowed it, or whatever vehicle we happened to have could pull it, but I'm starting to think 7 pin is the way to go.
My boler American came with an odd pin female on the front of the trailer, and wiring that had a 7 pin male on one end and 4 pin on the other.
Electrical. Hook Up?
and a different trailer with the same connector
Greetings... which Boler (?) did i buy?
I swapped that out for a 7 pin female on the trailer and made two cables one with a 7 blade - 7 blade and one with a 7 blade - 4 pin.

Advantages, trailer can be easily configured to either 7 or 4 pin TV's and the cable can be removed during storage (one more thing to prevent theft)
Disadvantage, one more connection to go wrong, but that is no different than using an adaptor in my mind.
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Old 06-10-2014, 12:36 PM   #21
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Think with something that has been in service since 1972 and sounds like it had some less than ideal repairs and modifications done to the wiring probably smart to start over.

Known good can avoid a whole lot of "what now?" issues, especially with wiring and save time in the long run.

I do think a lot of trailer places run way to lite of wire for charging, been a lot of discussions on the forum about replacing that with something of a gauge suitable for RV charging. Some folks new to the whole thing do get caught short trying to run 3 way fridge on 12 volt and arriving with a flat battery.

That said 7 pin is the easiest and most standard way to accomplish that charging with the proper wire. I think that was the point being made (at least on my part)
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