Cayenne CTT Charging Through Tow Wiring?
01-27-2018, 02:02 PM
#1
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Cayenne CTT Charging Through Tow Wiring?
I'm not a big fan of running wires on the outside of my cars possibly damaging the paint, for trickle charging via a battery tender or putting the wiring trough the seals and possibly causing them to fail prematurely.
Can I charge it via my 7 wire trailer plug?
I did a search and went thru over 100 posts but no luck. I do have voltage at the rear pins but am not sure if this may cause problems. I can solder wires to a plug I got at Walmart. I just want to make sure I don't cause problems to the CAN bus or any other systems. I really don't want to drill any holes or possibly damage rubber seals to run the wiring to the rear cig lighter. I do off orad it a bit thru mud in spring and winter so seal integrity is important to me.
Thank you in advance. It's been a while since I posted on Rennlist and your advice has been very helpful.
Ernie
Can I charge it via my 7 wire trailer plug?
I did a search and went thru over 100 posts but no luck. I do have voltage at the rear pins but am not sure if this may cause problems. I can solder wires to a plug I got at Walmart. I just want to make sure I don't cause problems to the CAN bus or any other systems. I really don't want to drill any holes or possibly damage rubber seals to run the wiring to the rear cig lighter. I do off orad it a bit thru mud in spring and winter so seal integrity is important to me.
Thank you in advance. It's been a while since I posted on Rennlist and your advice has been very helpful.
Ernie
Last edited by ejsaenz; 01-27-2018 at 02:03 PM. Reason: forgot to proofread for spelling errors.
01-27-2018, 07:57 PM
#2
That's a great idea. Looking at the diagrams, in addition to the terminals for the lights and brake there is also a 12v and gnd connection. As long as that 12v is unswitched (ie: always live) charging thru it should be no issue at all as long as you aren't pumping more current into it than it's rated for drawing out of it. Since trickle chargers usually max out at about 2a, it should be no problem at all.
Looks like the factory connector is "seven blade"
http://www.hopkinstowingsolutions.co...ng-guides.html
cheers,
c
Looks like the factory connector is "seven blade"
http://www.hopkinstowingsolutions.co...ng-guides.html
cheers,
c
01-27-2018, 09:15 PM
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There is 12V there when I checked with a test light. My battery maintainer can output 4A and is switchable to 2A. I was just worried that it may affect the canbus. I guess I'll wire it tomorrow and keep my maintainer/tender at 2A.
This is the one I use:
https://www.cyclegear.com/accessorie...and-maintainer
It has worked well on my 944 cabbie and CTT but I don't like the wires draped on the paint.
Thank you
This is the one I use:
https://www.cyclegear.com/accessorie...and-maintainer
It has worked well on my 944 cabbie and CTT but I don't like the wires draped on the paint.
Thank you
01-29-2018, 10:48 AM
#4
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Get a Battery Tender. Hard wire it under the hood to the jump connections. You are done. It has a quick disconnect so you'll have no problems. You can store the connection under the panel when it is unplugged.
01-29-2018, 11:16 PM
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No matter where I connect I would have to run the wires out a gasket and along the paint that way. I don't want to damage the paint or place undue pressure on the seals that way. It gets a bit windy in my area and font want the paint worn out by the rubbing and I drive it only on weekends if that much due to driving a company vehicle. A bit nitpicky but it's still a concern for me. The less damage I create, the better for the Cayenne.
01-30-2018, 02:52 PM
#6
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A quick search did not find a wiring diagram for the trailer wiring. The only thing I saw was that the positive power goes through a relay, that is probably switched with the key, otherwise someone could easily drain your battery. Because of that, you would not be able to charge through it.
01-30-2018, 03:41 PM
#7
A quick search did not find a wiring diagram for the trailer wiring. The only thing I saw was that the positive power goes through a relay, that is probably switched with the key, otherwise someone could easily drain your battery. Because of that, you would not be able to charge through it.
cheers,
c
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01-30-2018, 08:25 PM
#8
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The module listed as the trailer connection device has battery voltage directly to it from fuse #19 (25 or 30A).
Fuse 19 gets its power from the battery rail which is always hot.
Pull that fuse and check the voltage at the hitch to confirm its the correct line. The brake booster gets its power from the same circuit.
The connector pin is C10 red/wht but the diagram does not indicate which or where this connector is located.
Fuse 19 gets its power from the battery rail which is always hot.
Pull that fuse and check the voltage at the hitch to confirm its the correct line. The brake booster gets its power from the same circuit.
The connector pin is C10 red/wht but the diagram does not indicate which or where this connector is located.
01-31-2018, 12:38 AM
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The module listed as the trailer connection device has battery voltage directly to it from fuse #19 (25 or 30A).
Fuse 19 gets its power from the battery rail which is always hot.
Pull that fuse and check the voltage at the hitch to confirm its the correct line. The brake booster gets its power from the same circuit.
The connector pin is C10 red/wht but the diagram does not indicate which or where this connector is located.
Fuse 19 gets its power from the battery rail which is always hot.
Pull that fuse and check the voltage at the hitch to confirm its the correct line. The brake booster gets its power from the same circuit.
The connector pin is C10 red/wht but the diagram does not indicate which or where this connector is located.
01-31-2018, 07:36 PM
#10
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how do I keep the wires from rubbing on the paint as it sits outside in the wind?
No matter where I connect I would have to run the wires out a gasket and along the paint that way. I don't want to damage the paint or place undue pressure on the seals that way. It gets a bit windy in my area and font want the paint worn out by the rubbing and I drive it only on weekends if that much due to driving a company vehicle. A bit nitpicky but it's still a concern for me. The less damage I create, the better for the Cayenne.
02-01-2018, 07:20 PM
#11
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Cheers,
Tom F
02-01-2018, 08:43 PM
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12-18-2020, 03:33 PM
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I apologize for the late reply. Here are my results:
I wired up a round trailer plug I got at walmart and using a spare 12v connector from one of my battery tenders with an old extension cord, I was able to make the external charging port with the existing tow wiring and trailer outlet.
It worked out great! No issues and it kept my battery topped off.
Thank you all for your help. I've since sold the Cayenne and put all the money into much neglected maintenance on my 944 S2 Cabriolet.
I wired up a round trailer plug I got at walmart and using a spare 12v connector from one of my battery tenders with an old extension cord, I was able to make the external charging port with the existing tow wiring and trailer outlet.
It worked out great! No issues and it kept my battery topped off.
Thank you all for your help. I've since sold the Cayenne and put all the money into much neglected maintenance on my 944 S2 Cabriolet.
