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Old 05-30-2008, 10:58 PM   #1
Mojambo
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Default trailer wiring w/module: 12v or not?

Hey,

I was looking at posts about the trailer wiring. I see that some run a 12v assisted module. this Module would have 6 wires coming IN(one is 12V) and goes out to a 4 pin trailer connector.

no 12V:
http://www.hiddenhitch.com/ part #119130
http://www.hiddenhitch.com/fitguides/pdf/N119130.pdf

12V:
http://www.hiddenhitch.com/ part #119186
http://www.hiddenhitch.com/fitguides/pdf/N119186.pdf

I've found 2 kinds of boosters/modules, some have a 12v source and wires for lights. Some have no 12v and only 5 wires into a 4 pin connector.

Question is:

Can the stock wiring handle 2 more lights from a trailer? do you need the 12V assisted module?


I looked at the wiring diagram for the WRX wagons, I do see the 6pin connector that comes stock on it. I can't remember if this 12v in the 6 pin is seperate from the other wires in the OEM rear harness and has its own fuse(I don't think it does)

if there is no seperate 12v wiring with fuse for the Wagon trailer harness, that means that we can tap the wires at the light and take the power from the tailights.

Of course the added 12v won't hurt, but it seems to me that it's not needed.

Can someone pls confirm or deny this?
(I can't see the rear tails/wiring harness diagram right now)

Thanks,

Eric
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Old 05-30-2008, 11:12 PM   #2
Cougar4
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If you are just tieing to a couple of 25 watt lights on the trailer then you should be ok just using the stock wiring to drive the extra lights.
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Old 05-31-2008, 03:16 PM   #3
Mojambo
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bump- Anyone try this with a non 12v boosted module?

E
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Old 05-31-2008, 03:35 PM   #4
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OK,

so I looked at the wiring diagram and compared the sedan to the wagon. You can see that the wagon has the extra connector and pin 6 and 3 are used for the power to the connector. If you look back down the line, they hit an intersection where the sedan and wagon wiring is the same. From there, they are both sharing the same fuse. (#16?)



I do believe that there is no supplemental 12v powering the rear trailer connector. It all comes from the same source(fuse).
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Old 06-12-2008, 04:53 PM   #5
jdubya301
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i am gonna bump this up... i just got a trailer and i am trying to figure out what i need.

i would rather install a non 12v system so that i dont have to run a wire all the way up to the battery.

any help would be appreciated guys
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Old 06-12-2008, 08:51 PM   #6
Cougar4
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I'll repeat my first reply on this:

"If you are just tieing to a couple of 25 watt lights on the trailer then you should be ok just using the stock wiring to drive the extra lights."

If you need to run more lights than that, I would recommend you get the module to drive the trailer lights.
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Old 06-12-2008, 09:26 PM   #7
jdubya301
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Quote:
Originally Posted by Cougar4 View Post
I'll repeat my first reply on this:

"If you are just tieing to a couple of 25 watt lights on the trailer then you should be ok just using the stock wiring to drive the extra lights."

If you need to run more lights than that, I would recommend you get the module to drive the trailer lights.

o ok, i didnt catch that cougar.. thanks
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Old 06-13-2008, 01:40 AM   #8
Cougar4
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You're welcome for the help.
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Old 06-13-2008, 01:48 AM   #9
jdubya301
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would i need one of those modulator boxes, or can i just tap the corresponding wires and connect them to one of the trailer plugs? sorry i know nothing about trailer wiring.

all i know is some cars require those modulator boxes because of the way the ecu's control the taillights. that was how all of my families' vehicles were, just wondering if the wrx will be the same way.
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Old 06-13-2008, 02:26 AM   #10
Cougar4
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The ECU controls things for the engine and doesn't have any control of the taillights. The flasher unit needs to be able to supply the power for the trailer lights. Maybe you are thinking of a box for the brakes on a trailer.
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Old 06-13-2008, 09:32 AM   #11
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You DO need one of those modulator boxes... it has nothing to do with the ECU, it is to convert the lighting scheme used by most imports into something that a 4 wire trailer will handle. (blinking the brake light as a signal) You can build one with a couple diodes, or just buy one of the sealed ones fairly cheap. (I installed the walmart one that is around $10 IIRC a month ago, works well, but you need to use an extension with it, I wouldn't recommend putting the converter box outside the vehicle)

http://www.ontheball.com/taillight_convert.htm
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Old 06-13-2008, 12:45 PM   #12
jdubya301
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Thank you for clarifying that rkramer.. thats exactly what i wanted to know.

yeah i had a late night i wasnt thinking properly... haha i know the ecu is for the motor.. lol. i think what i was trying to refer to was the fact that most vehicles have complicated (and almost always computer controlled) lighting systems, that need decoding for the 4 pin trailer harness.

thanks guys. walmart, here i come
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Old 06-14-2008, 03:02 PM   #13
Mojambo
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I did end up finishing this last week. I used a non 12V assisted module. Works great! Lights are nice and bright and everything works perfectly.

As cougar stated. if you are using many lights on the trailer, a 12V assisted module is a great idea.

As I see it, an Impreza probably shouldn't be pulling a trailer that is so big/heavy load capacity that it has many lights.(there are always exceptions)

thanks for the help guys!

Eric
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Old 06-15-2008, 12:25 AM   #14
jonney_boy
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another option, LED trailer lights are now VERY common and cheap. They draw WAY less power than even a 25w bulb. just something to consider

led indicator lamps on my trailer at home are like $5 each.... led signal lamps (turn signal + brake lights) are like $20-25 each.....
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Old 06-15-2008, 03:43 AM   #15
jdubya301
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Quote:
Originally Posted by jonney_boy View Post
another option, LED trailer lights are now VERY common and cheap. They draw WAY less power than even a 25w bulb. just something to consider

led indicator lamps on my trailer at home are like $5 each.... led signal lamps (turn signal + brake lights) are like $20-25 each.....
good point.. i love the look of led tails on trailers. i am converting my jetski trailer to serve as a motorcycle trailer. leds would be nice.... no burning out hot bulbs when they hit the water. i may just have to suck it up and spend the extra few bucks!
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