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Install New UHF - run off which fuse number?

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  • #1

    Install New UHF - run off which fuse number?

    Hi Guys,

    Installing a GME TX3100 radio in my 150 2010 GXL 3L Diesel Prado.

    Going to run it off the 12v power fuse, is that fuse number 1 under the dash or am i better running it off the cigarette lighter. If the lighter is better what number is it? Can't see it listed in the book but assume its 12v power??

    I'm connecting it via a Blade Fuse Wire Tap adaptor 12-24v 30A + 20A Max

    Thanks
    Tags: None
  • #2
    It is better to run the UHF straight off the battery, with both positive and earth back to the battery, with a fuse on the positive. The fuse is also probably better to be 2A or 5A max as the UHF shouldn't draw a lot of power.
    2015 GX Prado 3L Auto, in the process of being fitted out.

    Comment

    • #3
      Originally posted by MYT150 View Post
      It is better to run the UHF straight off the battery, with both positive and earth back to the battery, with a fuse on the positive. The fuse is also probably better to be 2A or 5A max as the UHF shouldn't draw a lot of power.
      Will that mean that there is power constantly running to the device?

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      • #4
        Originally posted by 8legsman View Post
        Will that mean that there is power constantly running to the device?
        Yep.

        Mines tapped into the supply to the 12v socket in the centre console.
        Spilsy
        Today is the tomorrow you were shitting yourself about yesterday - Billy Thorpe

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        • #5
          Originally posted by 8legsman View Post
          Will that mean that there is power constantly running to the device?
          Yep so if you accidentally leave the UHF on it'll flatten your battery.
          I tapped into the ciggie lighter as well.
          2007 GXL V6 - ARB Bullbar with LED lights, snorkel, extractors, 2 1/4" dual exhaust, K&N filter, dimpled/slotted rotors, headrest dvd players, Ebay Satnav/reverse camera, GME 3100TX, Tigerz11 Side awning on custom brackets with Maxtrax mounts, 300W Invertor, ARB Underbody protection, Lightbar and STZ 265/70 tyres.
          Wish list in order I'll get them: Sliders, 2" lift, E-locker, Winch bar with winch.

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          • #6
            Originally posted by MYT150 View Post
            It is better to run the UHF straight off the battery, with both positive and earth back to the battery, with a fuse on the positive. The fuse is also probably better to be 2A or 5A max as the UHF shouldn't draw a lot of power.
            Why does he need to run both back to the battery? A cb wont use much power put it on the ciggie liger circuit, whats your logic on doing that? why cant he use an earth from under the dash its not an amp using a heap of current why even goto the battery. Why does the cb need to be live all the time?
            I got myself some Big Horn Maxxis and was telling my landrover lover mate he said what size did you get I told him 265/75/16 he said I didn't know they came that small.

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            • #7
              Its fairly good practice to run electrical things back to the battery. Belts and Braces type thing.
              I'm not sure its strictly necessary in this instance. If you do connect directly back to the battery, you could set it up with a relay to switch with the ignition...
              Spilsy
              Today is the tomorrow you were shitting yourself about yesterday - Billy Thorpe

              Comment

              • #8
                I have run mine from Battery so it has power all the time.
                It's good if your waiting for someone you can turn the car off and leave the UHF on
                If you run off accessories it turns off after 20 min or so.
                Must get around to running it off the AUX battery instead of the starter battery.

                Comment

                • #9
                  I have recently fitted a GME 3550s after reading many of the threads on PP. I have run it off the auxiliary battery. PP advice suggests that as well as constant power, the other important reason is that there is much less chance of the electrics causing interference to the radio this way.
                  2012 Crystal Pearl Prado Altitude 150 Diesel Auto. Toyota mats and rear rubber mat. Toyo Open Country AT2's 265 65 R17 LT. OEM nudge bar. dual battery set up with Optima D34, rear power points front and rear Anderson plugs. Lightforce LED combi light bar. Kingsley side steps. Outback Ideas recovery points. Dr Air Pro 150 ltr air compressor. ARB 60 ltr fridge. GME 3550s UHF radio. Hema HX1.

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                  • #10
                    I was told to run straight off the battery in case you lost your keys while out in the bush you could smash a window and call for help.
                    Doesn't drain much off the 2nd battery anyway.

                    Comment

                    • #11
                      My setup provides me with 2 x 20 amp power feeds directly into the cab (via firewall grommet)
                      1 x Dual Battery source (Always On)
                      1 x Started Battery source (ACCessory ON)
                      (both fused before entering the cab)
                      With smaller fused for all the funnies inside the cab.
                      - Dual USB Charger/Power Supply
                      - 12v Accessory Socket(s)
                      - Dual Volt-Meter
                      - CrashCam
                      - UHF

                      You should provide your UHF with the "best" power feed you can - when transmitting it uses between 2-5amp (radio dependant)
                      - normal Accessory Sockets may give you that much, (some sockets in the Prados do 120W - eg approx 9amp @13.4v) but if you plug something else into that socket - eg. GPS, HandHeld UHF Battery Charger, Neck Massager etc. you are cutting it close.
                      - this may affect your transmit quality/range/etc.

                      Disclosure: the above is mostly some good guess work, but have not jumped under the hood with sensitive measuring equipment to verify the above.
                      jaco150
                      jaco150
                      Junior Member
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                      Last edited by jaco150; 11-08-2016, 11:52 PM. Reason: updated some figures

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                      • #12
                        Originally posted by pradosteve97 View Post
                        Why does he need to run both back to the battery? A cb wont use much power put it on the ciggie liger circuit, whats your logic on doing that? why cant he use an earth from under the dash its not an amp using a heap of current why even goto the battery. Why does the cb need to be live all the time?
                        That was my plan, there's plenty of places to earth it under there. I think it only draws 5 watts so running git back there was an overkill i thought.

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                        • #13
                          Hi Guys,

                          Used the fuse tap off the 12v fuse to power the UHF and I can report no issues at all. The UHF works as it should, and my other devices running off the 12v are not affected by it at all.

                          I guess the only down side is that it does turn off once the ignition is turned off, good that it will not drain the battery if left on, but I guess as "33som" said, if you need to break into your car to call for help this is not possible.

                          Cheers

                          Comment

                          • #14
                            I personally run mine off ignition, simply because I'm a forgetful bastard and would leave it on and flatten my battery. The constant power source though is a great idea, I might run a switch on mine to activate a constant power in case of emergency. Then again, easy enough to wire it up in the bush if required, so long as I'm not mortally damaged... LOL
                            2013 VX 3.0 D4D Family mover

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                            • #15
                              Hi All
                              Sorry for dredging up an older thread. I'm picking up my 2013 150 GXL during the week having traded the old faithfull 120 GXL. Anyway I intend to install the UHF and Smoothtalker Iphone6 cradle from the 120 into the 150 next weekend. Both need 12 volts and both were installed professionally in the 120.
                              From spending way too much time searching today I'm picking up three common ways of getting 12v.
                              1. - straight off the battery
                              2. - off the centre wire of cigrette lighter / aux power
                              3. - wire tapping into an empty fuse scket using something like this - https://www.jaycar.com.au/wire-tap-m...e-15a/p/SF5122
                              I guess it's like a Prado or Pajero thing or am I missing something? Is there a clearly better way of doing it?

                              BigPat

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