Can you please tell me about the power setup for your radios. I am interested in setting up a ic 7000 w/ auto tuner OR go simple with a Yaesu 8900. I like the simple idea just because it should be more useful for me but we are looking at a long trip to Alaska towing the raptor and I want to be sure we have commas in an emergency. . I was thinking about using the uplifted switches for power but in reading it sounds like you have a better solution. And more on the time delays as well please if you don’t mind. Sources or links of components would be helpful. TIA. K0WIT
Sources / links for most of this will be a little hard, most of the stuff came out of my junk box and was stuff I had already on hand. Some of the stuff used predates the Internet. I purchased very little specifically for this install.
The power setup for my radios (except the scanner) is pretty basic and straight forward. The scanner is a bit more complex, as that is the only radio using the time delayed relay, so I will address those two power systems separately.
My power for the TS-480SAT and the FT-8900R comes directly from the battery to the radios under the back seat. From the battery posts I run 4 gauge wire to a fuse holder / terminal board near the passenger side firewall. This terminal board is hot all the time. The 4 gauge wire has a blade type fuse right at the battery posts protecting this entire run.
From this always on terminal board I run another set of fused 4 gauge wire across the firewall (in flex) to the factory rubber pass through near the steering column. I drilled a small hole in this pass through and run the 4 gauge inside the cab there. There is a rubber nipple on both the inside and outside of this pass through that is perfect for this type of thing, and well to the side of the existing wires. A bit hard to reach, but works extremely well. Because the hole drilled is smaller than the wire it is an intentionally tight fit, and very water resistant.
The power wires then go from the inside of the firewall right over to the kick panel that is beside the drivers left foot. Behind the kick panel and under the door jams there is a set of plastic wire trays running all the way back to the back seat, the wire is laid and tie wrapped into that. The wire comes out behind the back seat, where I have another terminal board that breaks it out to each radio (the TS-480SAT and the FT-8900R). Each radio is also individually fused (both hot and ground sides) coming off this terminal board.
So the TS-480SAT and the FT-8900R are always hot, and can be left on, on purpose or by accident, with the vehicle turned off. Since the TS-480 is on the dash I have never accidentally left that one turned on. However, the FT-8900R has been left on several times by accident. This especially happens if I have closed the sunglasses holder for some reason after turning the radio on. To date this has not killed the battery, but I did leave it turned on for an entire weekend once.
I power almost nothing directly from the Upfitter switches. My truck is a 2018 (but I think this applies to 2017 to 2019 trucks) and the upfitter switches are fused / rated at 15 Amps (AUX 1 and 2), 10 Amps (AUX 3 and 4), and 5 Amps (AUX 5 and 6). However, in my opinion the wire used for them is too small for those ratings, particularly AUX 1 and 2. AUX 1 and 2 are 17 ga wire, AUX 3 and 4 are 20 ga, and AUX 5 and 6 are 22 ga. So for anything more than a couple of amps I use the AUX switches to drive relays wired with larger wire. The exception to that is my AUX 6 use, that drives my radar detector and that is a pretty small load, so I use just the AUX switch and the factory provided firewall pass through wires.
AUX 1, via relays, drives the antenna lay down in the down direction, AUX 2, via relays, drives the antenna lay down in the up direct, they are fail safed by design so accidentally turning both on will drive the antenna down but do no harm. AUX 3, via relays, runs the on-board air compressor. AUX 4, via relay, is used to kill the scanner right now, overriding the off time delay system (this is a recent addition). AUX 5, with a time delay timer / relay, runs the scanner and screwdriver HF antenna control. AUX 6 is direct connected to the radar detector.
To house all relays, except the time delay timer, I did purchase a relay box and install it under the hood, on the drivers side inner fender. The box used was similar to this
https://www.amazon.com/ONLINE-LED-STORE-12-Slot-Installation/dp/B072KJNPHJ/ and I used Bosch relays. I think you can buy the same thing with relays and fuses included, but I already had the relays / fuses and only needed the box.
For the delayed relay stuff I used an off delay timer, similar to (but not the same thing, the model I used is older and no longer sold) this
Qianson DC 5V 12V 24V Digital LED Display Infinite Cycle Delay Timer Switch ON/OFF Relay Module (DC 12V) - - Amazon.com However, if I was buying new today I would be tempted to try this
10 Amp Mini Timer Time Delay Relay .2 Sec to 400 days 6V 12V 18V. Power On Off Delay, Cycling and Trigger - - Amazon.com
That timer powers (its “load”) a standard relay controlling the always on power from the same firewall mounted terminal board that powers the TS-480 and FT-8900R.
Works like this, when AUX 5 switch is powered on (either turning it on or turning on the truck if AUX 5 is left on) the switched AUX 5 power is applied to the trigger of the delay timer, causing it to close its internal relay. This applies power to the coil of a standard automotive relay, providing unswitched (always on) power to the scanner. It makes the unswitched power now switched / controlled by the off delay timer via the AUX 5 switch. When I shut AUX 5 off, or when I turn off the truck, the trigger is removed, and the off delay timer shuts off its internal relay, killing the standard relay, after the programmed time, currently one hour. So turn off the truck or turn off AUX 5 and one hour later the scanner shuts off.
I added the ability to override and kill the timer using AUX 4. Sometimes you just want to kill the scanner right now, say driving in the gate to a military installation or something. I could, of course, open the center console and turn the radio off with the front panel control, but I wanted a quicker way.
So AUX 4 runs another standard automotive relay, and the “always on” power source to the off delay timer is run through the NC contacts of that relay. As long as AUX 4 is off then the off delay and AUX 5 can do their jobs. But turn AUX 4 on and it kills the power to the delay timer, turning off the scanner right now.
T!