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Old 04-07-2017, 03:58 PM   #1
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Hard-Wiring Tire Pressure Monitor vs. 12-Volt Recepticle

I'd wanting to hard-wire my tire pressure monitor rather than install a
second 12-volt recepticle. Can someone inform me the most direct and
quickest way of doing this - perhaps someone with a like coach, considering the difference in dash wiring among coaches. Thanks, in advance, Larry.
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Old 04-07-2017, 04:08 PM   #2
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Quote:
Originally Posted by hugh37 View Post
I'd wanting to hard-wire my tire pressure monitor rather than install a
second 12-volt recepticle. Can someone inform me the most direct and
quickest way of doing this - perhaps someone with a like coach, considering the difference in dash wiring among coaches. Thanks, in advance, Larry.
Sorry I can't answer your question. Which TPMS system do you have? I have the TST 507 & I held off hard wiring as I wasn't firm on where I wanted it. As time passed I realized how rarely it needs to be charged so I believe I might just leave it the way it is.
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Old 04-07-2017, 04:13 PM   #3
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If you have the TST-507, I can tell you from experience that the cigar-lighter plug contains nothing but a fuse, a resistor for the indicator LED, and the LED itself.

In the power cord the red wire is +12 volts, and the white wire is ground.

Easy-peasy.

Pop
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Old 04-07-2017, 04:18 PM   #4
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Larry-

I did this for my GPS. I had a spare 12V source inside the dash. I put a two-pin connector on it. Next, I took apart a 12V cigarette lighter adapter (one matched to the GPS) and replaced the contacts with a pair of leads. On those leads I put the matching two-pin connector. The connector and modified adapter went inside the dash.

What's nice about doing it this way is that I didn't modify the GPS in any way. That's important, as I have a Garmin 760LMT; its traffic signal comes through the power supply cord. What Garmin tells you is that you're supposed to stretch the cord out to receive the best traffic signal. That would not work inside the dash very well. I bought and modified the non-traffic (and less expensive) 12V adapter, as in the paragraph above. If I want to get the traffic on the GPS, I plug the 12V adapter with the traffic receiver into the dash cigarette lighter socket, and then into the GPS- temporarily bypassing the in-dash power.
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Old 04-07-2017, 05:53 PM   #5
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I have had TST 507 and Tire Tracker 500. Only need to charge the battery every couple few weeks, so don't leave it wired at all.
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Old 04-07-2017, 09:03 PM   #6
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Thanks for the responses. I, too, have the TST 507 and find it cumbersome not having it in a fixed spot where I can view it without having to fumble around with it. I could resolve my concern by knowing where on the left side of the steering column I might tie in to a hot and ground wire. Figured someone had done this already. Larry
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Old 04-07-2017, 09:07 PM   #7
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I also have a TST 507. I mounted it on my driver side window. Hard wire came up through the edge of the dash. When not in use it tucks alongside the top of the dash.
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Old 04-07-2017, 09:27 PM   #8
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fuse wiring option (found on another post)
https://www.amazon.com/gp/product/B0...tap&pldnSite=1
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Old 04-07-2017, 10:07 PM   #9
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Whenever I install something that has a 12 volt cigarette lighter plug, I just purchase a female plug. I hard wire the wires from the female plug into a 12 volt power supply. I connect the two plugs together and then tape them so they don't pull apart, leaving everything under the dash. This way, I don't change anything on the unit I'm trying to power. I tapped into the coach's cigarette lighter plug for power.

Your dash should have a little tower on the left side that has an A/C vent and light switch. Near the top of the tower, are two screws, use one or both to make a bracket for your tire monitor. It will be out of the way, but in view. I drilled a 1/2" hole on the side of the tower to run the TST cord, my laptop cord and USB cable through to under the dash. You can't see the hole when looking at the dash.

This is the mount I made for my laptop. I later mounted the TST monitor under the left edge of the laptop. I used the two screws already part of the dash and used two sided tape on the back side.





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Old 04-08-2017, 07:31 AM   #10
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Dutch Star Don & Others...many thanks for your GOOD responses. Now,
to "get to" the project!
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Old 04-08-2017, 08:00 AM   #11
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Here are a couple of pictures I should have included with my post (to clarify the muddled description). One shows the unassembled, modified adapter, and the second the adapter mounted in the harness (top) with the 12V connectors (right).

Let us know how your project turns out.
Attached Thumbnails
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ID:	157579   Click image for larger version

Name:	GPS_and_Camera_Wiring_Harness.jpg
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Size:	100.4 KB
ID:	157580  

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Old 04-08-2017, 12:05 PM   #12
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I have the EezTire and I only have to charge it every 3 weeks or so. No hard wire needed. Double stick tape on left side of dash. The tape doesn't stick all that well so I just pull it off and let it charge overnight while camping.
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Old 04-08-2017, 12:37 PM   #13
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BBelanger...that's good. Really, whatever works & satisfies. I still prefer
the idea of something a bit more "permanent". Thanks to All!! Larry
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Old 04-08-2017, 11:21 PM   #14
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I just like the clean looks of no wires.
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