Wiring for 7-way, brake controller, Seattle area - Fiberglass RV


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Old 10-08-2016, 12:00 PM   #1
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Wiring for 7-way, brake controller, Seattle area

I have a friend who may help me with wiring but I understand it isn't all that simple and would also like to price it out at "local" shops. I got a quote at Mann's in Bellevue for converting the 4-way to 7-way and adding the brake controller, but they need it for four hours and if possible I'd rather go somewhere where I had something to do for the four hours. So questions-

a) trustworthy shops for wiring in the Puget Sound area (I'm on Whidbey)
b) how hard is it to do? My friend knows what he is doing but at best we'd have the car up on those little ramps. My regular mechanic suggested it could take a long time and I'd rather get someone who does this kind of thing a lot.
c) what about Camping world or Uhaul?
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Old 10-08-2016, 12:06 PM   #2
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I recommend Roy Robinson RV Service. We have done a lot of RV business with both sales and service and trust them to do it right for a fair price.

On Whidbey, Main Street Collision can do it. They installed the hitch and wiring on our CRV. Again, high quality work for a reasonable price.

I think the effort is going to depend a lot on the vehicle and current equipment. When I put the controller in the Ridgeline, it already had the 4 and 7 pin connectors (factory tow package) and the install was basically plug and play.

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Old 10-08-2016, 12:37 PM   #3
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The Forester has 4 way installed (that was prewired) but not 7 way so they have to run the wires up to the front for that. Thanks, I'll check those.
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Old 10-08-2016, 01:56 PM   #4
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Originally Posted by Bobbie Mayer View Post
The Forester has 4 way installed (that was prewired) but not 7 way so they have to run the wires up to the front for that. Thanks, I'll check those.
In addition to having to run the brake wire from front to back they will also need to add a charge line.
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Old 10-08-2016, 03:08 PM   #5
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The Forester has 4 way installed (that was prewired) but not 7 way so they have to run the wires up to the front for that. Thanks, I'll check those.
Roy Robinson would be ideal for a Forester since they are a Subaru dealer as well as an RV dealer.

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Old 10-08-2016, 03:28 PM   #6
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In addition to having to run the brake wire from front to back they will also need to add a charge line.
Why?

Maybe he does not need a charge line, nor want to pay extra for it.

I get along fine with not charge line. What is different here?
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Old 10-08-2016, 03:37 PM   #7
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Why would you not add the charge line at the same time? It's the cost of some wire.
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Old 10-08-2016, 03:55 PM   #8
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Why would you not add the charge line at the same time? It's the cost of some wire.
Because "It's the cost of some wire," plus the cost of labor, plus maybe you don't need it, plus maybe your alternator can't handle the added load, etc.

I have never had one and never missed it. Just pointing out that it is a viable option to not have one.. it is not a requirement.
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Old 10-08-2016, 03:58 PM   #9
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Why?

Maybe he does not need a charge line, nor want to pay extra for it.

I get along fine with not charge line. What is different here?
The charge line keeps the trailer battery charged while underway and recharges it if it's down on departure. Great if you are running the fridge on 12v or have dry camped.

I agree that any extra cost of running a charge c wire should be minimal.

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Old 10-08-2016, 04:44 PM   #10
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I stated "7-way" which implies charge line, and I do want that, too. Though I do have a question- there is an Auxilliary line in a 7-way. What would one use that for? Backup lights? Something else?

Roy Robinson is a possibility as I could look around at other future tow vehicles (not Subarus!) at the same time. I gather they are next to the dealership? The only problem I have is that in my experience dealerships don't get things done in a timely manner and I want to take it and wait for it if done on the mainland.

Mann's in Shoreline, I could go next door to Carter Subaru and car shop, too. I know they get things done on time as they did my hitch and initial wiring, so maybe I'll check there.
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Old 10-08-2016, 05:05 PM   #11
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The various Roy Robinson facilities are clustered next to the freeway. Sometimes you do need to schedule a ways out.

The seventh wire is for backup lights as you guessed.

Their new car lines are Chevrolet and Subaru but they have a good used car selection. That's where we bought our CRV.

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Old 10-08-2016, 05:51 PM   #12
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Originally Posted by Bobbie Mayer View Post
I stated "7-way" which implies charge line, and I do want that, too. Though I do have a question- there is an Auxilliary line in a 7-way. What would one use that for? Backup lights? Something else? ...
From e-Trailer:

Expert Reply:
The center pin on the 7 way connector can be used for many different purposes, although it is typically used to carry the signal from the reverse lights on the vehicle to the trailer. If the trailer does not have reverse lights or a reverse lockout for hydraulic surge activated trailer brakes, this pin can be used for any purpose such as providing an additional 12 volt circuit for any accessories on the trailer.
But sometimes the wiring is a lesser gauge you might want to make sure it is sufficient for your purpose. Heck, you could even use it for a back-up camera.. its up to you but any deviation from the standard might make your trailer or tug incompatible with others.

BTW, back-up lights on the trailer is also something that I never used.

BTW #2, if you do get a charge line, its best to have it only "on" when the tug's motor is running. And that relay adds a little cost. If the charge line stays hot when the tug is off, that can drain your tug's battery down under the right conditions (i.e. the fridge running on 12 volts).
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Old 10-08-2016, 06:02 PM   #13
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Originally Posted by gordon2 View Post

BTW #2, if you do get a charge line, its best to have it only "on" when the tug's motor is running. And that relay adds a little cost. If the charge line stays hot when the tug is off, that can drain your tug's battery down under the right conditions (i.e. the fridge running on 12 volts).
Good to know, thanks!
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Old 10-08-2016, 06:10 PM   #14
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BTW #2, if you do get a charge line, its best to have it only "on" when the tug's motor is running. And that relay adds a little cost. If the charge line stays hot when the tug is off, that can drain your tug's battery down under the right conditions (i.e. the fridge running on 12 volts).
Or if you forget to unhook the umbilical cord over night.

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