Adding component to the radio circuit
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Cargo Master
Joined: Jun 2008
Posts: 2,752
Likes: 5
From: Stillwater, OK
Adding component to the radio circuit
I recently installed a FRD04-POD/S iPod adapter to my 2008 F-250
The adapter works great once, then I have to either disconnect the battery, or pull the fuse to it. This resets the unit and it works great again...once.
The solution I've come up with is pretty simple really...
I am thinking about putting the adapter on the same circuit as the radio...so when the radio comes on, so does the adapter. The only thing this should change as far as the adapter goes, is that my iPod won't charge when the radio isn't on...but oh well.
My question is... how much more current can be drawn from the radio power circuit? I would like to just wire the adapter in straight parallel with the radio...if it won't overload the circuit. The other option I've thought of is to connect a relay to the radio power circuit and just have it close when power is applied...drawing power from my dash power point.
The adapter works great once, then I have to either disconnect the battery, or pull the fuse to it. This resets the unit and it works great again...once.
The solution I've come up with is pretty simple really...
I am thinking about putting the adapter on the same circuit as the radio...so when the radio comes on, so does the adapter. The only thing this should change as far as the adapter goes, is that my iPod won't charge when the radio isn't on...but oh well.
My question is... how much more current can be drawn from the radio power circuit? I would like to just wire the adapter in straight parallel with the radio...if it won't overload the circuit. The other option I've thought of is to connect a relay to the radio power circuit and just have it close when power is applied...drawing power from my dash power point.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
I would go the relay route. It will only add upto 200mA draw which shouldn't cause a problem at high volumes like direct wiring could. Using the radio's power will only cut power to the adapter when the key is off. It should work the same the rest of the time, charging while your driving. You would need an Amp turn on or Power Antenna wire to shut the adapter down when the radio is off.
Thread Starter
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Cargo Master
Joined: Jun 2008
Posts: 2,752
Likes: 5
From: Stillwater, OK
You would need an Amp turn on or Power Antenna wire to shut the adapter down when the radio is off
That's what I thought. I don't know the current draw of the adapter + charging...
the adapter works using the SAT modes so it can stay on whenever the radio is on. I just want it to reset on its own without having to pull the fuse all the time.
Post Fiend
Joined: May 2006
Posts: 10,007
Likes: 4
From: Central Florida
The radio has two power wires, A constant power wire which has power while the battery is connected or the engine is running. The constant wire also serves as a memory wire to keep the settings and time. Then there is a switched wire from the accessory wire from the column, this provides power to the radio when the key is on accessory or run. With the key off, only the constant wire has 12v. With the key on, both wires have 12v.
To turn power on and off with radio, you need a power output from the radio. These are usually either power antenna or remote/amp turn on.
Because the accy/switched wire is only a turn on wire, you can probably draw a decent amount of current through it without blowing the fuse. However, the radio is mostly likely not the only thing on that circuit and drawing power from it. Plus the factory wiring is not really intended for passing more current than absolutely necessary to save the manufacture a few dollars a mile on wire.
So using the switched power wire on the radio will disconnect the power to the adapter when the key is turned off. Using power from the constant wire, will keep the adapter on at all times.
To turn power on and off with radio, you need a power output from the radio. These are usually either power antenna or remote/amp turn on.
Because the accy/switched wire is only a turn on wire, you can probably draw a decent amount of current through it without blowing the fuse. However, the radio is mostly likely not the only thing on that circuit and drawing power from it. Plus the factory wiring is not really intended for passing more current than absolutely necessary to save the manufacture a few dollars a mile on wire.
So using the switched power wire on the radio will disconnect the power to the adapter when the key is turned off. Using power from the constant wire, will keep the adapter on at all times.
Thread Starter
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Cargo Master
Joined: Jun 2008
Posts: 2,752
Likes: 5
From: Stillwater, OK
yeah, that's how I wired it today...
currently, i am drawing power from the delayed accessory wire that turns the radio on. This allows the iPod adapter to remain on when the key is turned off until the doors are opened or the delayed off time is reached.
The new problem is that it seems the adapter needs to be turned on before the radio is turned on. I used to have a diagram of the radio head unit pins on the 24 and 16 pin connectors, but it will take some searching to find it. My idea to remedy this problem is to take power from two places. First, I will pull power from an ACC wire that is not on a delay...if I can find one. This will allow the adapter to power up before the radio, which is on a short delay. Second, I will continue to draw from the same source that the radio is on. This will allow the adapter to remain on until the radio is powered down.
I will have to use a diode on each side of the wire to prevent a backfeed condition, but it seems simple enough.
It would be even simpler if i could find a wire that was already set up like this... you know... for the OEM SIRIUS system...
currently, i am drawing power from the delayed accessory wire that turns the radio on. This allows the iPod adapter to remain on when the key is turned off until the doors are opened or the delayed off time is reached.
The new problem is that it seems the adapter needs to be turned on before the radio is turned on. I used to have a diagram of the radio head unit pins on the 24 and 16 pin connectors, but it will take some searching to find it. My idea to remedy this problem is to take power from two places. First, I will pull power from an ACC wire that is not on a delay...if I can find one. This will allow the adapter to power up before the radio, which is on a short delay. Second, I will continue to draw from the same source that the radio is on. This will allow the adapter to remain on until the radio is powered down.
I will have to use a diode on each side of the wire to prevent a backfeed condition, but it seems simple enough.
It would be even simpler if i could find a wire that was already set up like this... you know... for the OEM SIRIUS system...
Sit. Stay.
Joined: Oct 2001
Posts: 18,308
Likes: 20
From: Washington State
Wow! That's a lot of work. Think I'll just use the headphones that came with my iPhone instead. 
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Thread Starter
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Cargo Master
Joined: Jun 2008
Posts: 2,752
Likes: 5
From: Stillwater, OK
it's not really all that much work...
I'm just wondering what the guys that designed this thing were thinking...
name one piece of electronic equipment that does not need to be reset from time to time?
I'm just wondering what the guys that designed this thing were thinking...
name one piece of electronic equipment that does not need to be reset from time to time?
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