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02-08-2016, 11:50 AM
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#1
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Senior Member
Newmar Owners Club
Join Date: Jan 2015
Posts: 358
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Hard wiring TPMS
I have the TST Tire Pressure Monitoring system with coach and toad transmitters. I'm currently powering it from a standard DC plug, but its not ideal. The DC plug in the Dutch Star is always on, which means the TST transmitter will stay on unless I unplug it every time. The problem with that is when the toad goes somewhere, the TST transmitter beeps. It also means we often forget to turn it back on when we leave. The TST system does come with a mounting bracket that can be wired directly into DC. What I want is to wire it into a switched DC power line, which means its only powered when the ignition is on. That's where I need some advice. Looking under the dash, it is way past my pay grade to identify what wire might work, or how to take off any of the panels to even access the wiring. Again, wiring it up to an always hot DC line wouldn't be hard, but wouldn't be a solution. I hope someone can advise.
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Ron & Mary
2019 Newmar London Aire 4543
2014 Honda CR-V
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02-08-2016, 12:13 PM
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#2
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Community Moderator
Newmar Owners Club
Join Date: Feb 2011
Location: Point Pleasant Beach, NJ
Posts: 31,302
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I have a TST TPMS in my MH, and I don't leave it in the charger. Mine will run for several days without needing to be charged. Then I just charge it overnight.
BTW it is a good idea to add this device to your departure checklist, so you don't forget to turn it on.
__________________
Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS
No amount of money can buy you an extra second of time.
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02-08-2016, 12:21 PM
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#3
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Registered User
Monaco Owners Club
Join Date: Oct 2009
Location: Varies Depending on The Weather
Posts: 8,517
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Ron,
I prefer to have the TPMS transferred to my car once I am parked for a considerable length of time. Therefore I do NOT hardwire mine.
However, you could purchase a 12 VDC charger cord with an ON/OFF switch on the plug to turn the master control off when not needed.
BTW, my Tire Safeguard TPMS does not give me any errors if I happen to drive away in the car with the master control still in the coach. It recognizes that the car is no longer in range so it stops reporting any information for the car. It will do the same thing for the coach tires if the master control is in the car.
However it is simply a couple of button pushes to put it into the correct mode for either the car, coach or coach & car.
Dr4Film ----- Richard
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02-08-2016, 12:25 PM
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#4
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Senior Member
Thor Owners Club Ford Super Duty Owner
Join Date: Jul 2011
Posts: 3,790
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The problem is even if you find a switch circuit to tap into the internal battery will last for days. Best to plan on just turning it off and add to departure check list. TV antenna down, storage doors locked, wife in the coach,,,,
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02-08-2016, 12:47 PM
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#5
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Senior Member
Newmar Owners Club
Join Date: Jan 2015
Posts: 358
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Just wanted to clarify the question and situation. The TST monitor has a nice feature that when the power switch is "off" it will still power on whenever it sees DC power. That means I can leave it passively mounted into the hard wired bracket if I have the bracket hard wired into a switched DC circuitry, and it will turn on and off just like the instrument panel. I can still take the monitor with me if I want, and charge it other ways as well. Hard wiring the bracket just makes having it turn on automatically much more convenient. The question is not really about the best way to use the unit, but rather how I might find a "switched" power line in the dash area.
__________________
Ron & Mary
2019 Newmar London Aire 4543
2014 Honda CR-V
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02-08-2016, 01:02 PM
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#6
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Registered User
Monaco Owners Club
Join Date: Oct 2009
Location: Varies Depending on The Weather
Posts: 8,517
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To find a switched power source look for something that is powered by the ignition switch. You may have to go outside and review your chassis electrical panel to see what is marked with ignition.
My chassis panel is in the Front Run Bay.
Dr4Film ----- Richard
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02-08-2016, 01:06 PM
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#7
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Senior Member
Join Date: Mar 2014
Posts: 1,459
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Ditto on simply charging when needed. I've found that I can go about a month of regular use, almost daily, with the TST before it needs charging. Power it on and off as needed and charge occasionally.
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Gary 2021 NH Majestic
Ram 5500 with Bodywerks bed
Box Elder, SD and the road
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02-08-2016, 02:16 PM
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#8
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Senior Member
Join Date: Jan 2015
Location: So.Cal.
Posts: 297
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Easy peasy... stick one of these in your fuse box that has a switched 12v fuse.
Robot Check
__________________
2013 Itasca Sunova 30A
2006 Crownline 250cr
2012 Ram Laramie Longhorn
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02-08-2016, 02:46 PM
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#9
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Senior Member
Newmar Owners Club
Join Date: Jan 2015
Posts: 358
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Quote:
Originally Posted by Todd157k
Easy peasy... stick one of these in your fuse box that has a switched 12v fuse.
Robot Check
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That's the basic question I'm asking. Where is the (Freightliner) fuse box for the 2015 Dutch Star. I assume its not the same place as the DC fuse box for the coach.
__________________
Ron & Mary
2019 Newmar London Aire 4543
2014 Honda CR-V
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02-08-2016, 02:49 PM
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#10
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Senior Member
Newmar Owners Club
Join Date: Jan 2015
Posts: 358
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Quote:
Originally Posted by ghaynes754
Ditto on simply charging when needed. I've found that I can go about a month of regular use, almost daily, with the TST before it needs charging. Power it on and off as needed and charge occasionally.
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Keeping it charged is not a problem or concern. What I don't want to do is forget to turn it on, or leave it on and have it alarm whenever the toad leaves. Automatically turning it on or off with the ignition would solve both issues. I know its a convenience issue, so I don't want to make this out to be the only way it will work.
__________________
Ron & Mary
2019 Newmar London Aire 4543
2014 Honda CR-V
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02-09-2016, 07:31 AM
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#11
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Senior Member
Freightliner Owners Club
Join Date: Oct 2002
Location: Fairview TX
Posts: 2,453
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Probably shouldn't, but I have been known to tap into the ignition switch for such low- draw power. Best would be to look outside under the driver's seat for the " ignition-sitched" DC fuse panel. Read what items are on Ignition DC power, pull the dash panel and locate one of those wires and tap into it. Also, find the DC ground terminal deep inside the dash area by following some of the white wires to it.
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Slabman
2019 Newmar Ventana 3717
2007 Lexus LX470 Toad
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02-09-2016, 07:50 AM
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#12
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Registered User
Join Date: Mar 2010
Posts: 8,777
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Quote:
Originally Posted by WYRon
I have the TST Tire Pressure Monitoring system with coach and toad transmitters. I'm currently powering it from a standard DC plug, but its not ideal. The DC plug in the Dutch Star is always on, which means the TST transmitter will stay on unless I unplug it every time. The problem with that is when the toad goes somewhere, the TST transmitter beeps. It also means we often forget to turn it back on when we leave. The TST system does come with a mounting bracket that can be wired directly into DC. What I want is to wire it into a switched DC power line, which means its only powered when the ignition is on. That's where I need some advice. Looking under the dash, it is way past my pay grade to identify what wire might work, or how to take off any of the panels to even access the wiring. Again, wiring it up to an always hot DC line wouldn't be hard, but wouldn't be a solution. I hope someone can advise.
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Quote:
Originally Posted by WYRon
Just wanted to clarify the question and situation. The TST monitor has a nice feature that when the power switch is "off" it will still power on whenever it sees DC power. That means I can leave it passively mounted into the hard wired bracket if I have the bracket hard wired into a switched DC circuitry, and it will turn on and off just like the instrument panel. I can still take the monitor with me if I want, and charge it other ways as well. Hard wiring the bracket just makes having it turn on automatically much more convenient. The question is not really about the best way to use the unit, but rather how I might find a "switched" power line in the dash area.
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WYRon
Methinks if you are not confident that you can do it yourself you should have someone who is do it for you.
Mel
'96 Safari
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02-09-2016, 07:50 AM
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#13
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Senior Member
Newmar Owners Club
Join Date: Jan 2015
Posts: 358
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Quote:
Originally Posted by slabman
Probably shouldn't, but I have been known to tap into the ignition switch for such low- draw power. Best would be to look outside under the driver's seat for the " ignition-sitched" DC fuse panel. Read what items are on Ignition DC power, pull the dash panel and locate one of those wires and tap into it. Also, find the DC ground terminal deep inside the dash area by following some of the white wires to it.
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Thanks. I think locating the fuse panel, which I think is in a front outside compartment, is my best bet. The link Todd157k provided has a simple way to add another circuit. Trick will be to get the wire routed nicely from outside to inside.
__________________
Ron & Mary
2019 Newmar London Aire 4543
2014 Honda CR-V
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02-10-2016, 04:28 PM
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#14
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Senior Member
Newmar Owners Club
Join Date: Jul 2014
Posts: 130
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I have a 2016 DS that I wanted to be able to switch the braking system monitor on and off. I removed the little drawer and housing (4 screws). The 12v outlet wiring is right there. I cut into this and installed a switch above the gas feed on the side wall. Everything is easy to access. In addition, there is at least one additional wire set for an additional 12v outlet. This may be ignition controlled, I did not check. I also installed additional 12v outlet in the passenger wall assembly (with the cup holder) and modified the 120v outlet on the wall to 120v/2 USB ports. I set up all of my navigation equipment/tireminder monitor on the passenger window.
The rvibrake monitoring system is plugged into the center console next to the heater console on the switched 12v.
__________________
Lee & Stacy
2016 Winnebago View 24J
2012 Jeep Wrangler
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