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The way the relay is configured, it operates in reverse of what you're saying there. The active GPR prevents the power from reaching the radio.
Using the other small post gives you 12v power as soon as the key is turned on. My wife's compressor has been triggered off the GPR for years and always comes on when the key is turned on.
Interesting thought about using the other post though. That would prevent it coming on with the key. What does that post read with the key off? After the glow plugs cycle off? Perhaps I just hooked my wire to the wrong post.
The downstream side of the GPR is powered when the key is on and the truck is cold for up to two minutes. Any other time, that side of the GPR is dead zero volts. When the GPR is active, the voltage can get pretty low - which the Alpine doesn't like. So... this is when we want to prevent the Alpine from booting up.
With my configuration, we are connected to a relay that is wired to let the voltage pass from the key to the radio when the relay is de-energized. Power to the relay breaks the power circuit to the radio. The only time the power would reach the radio is key on AND Glow Plugs off.
It works in reverse of what one would normally think.
I just realized where the confusion is kicking in. I think in terms of DT relays, but many others do not. Single Pole Double Throw (SPDT) relay has been added to the instructions above. Sorry guys, I omitted an important detail.
Im looking for a automotive time delay relay for my stereo. I bought a Alpine double din head unit and it doesn't like "waiting to start". Any body have the same problem?
You could just put an inline switch on the radio power wire. sut it off before you start the truck.
The downstream side of the GPR is powered when the key is on and the truck is cold for up to two minutes. Any other time, that side of the GPR is dead zero volts.
I'm talking about the little posts, not the big ones. One has a key on 12 volt reference. The other gets a ground signal sent by the PCM to activate the relay and send the voltage to the 2nd large post that you're referring to.
Since the ground signal is what activates the GPR, then it would stand to reason that the post would revert back to a 12v hot wire after the glow plugs cycled off. I'll test it to confirm next time I'm playing with the wiring. As long as it's not a 12v hot post with the key off, I'll switch my trigger wire to that post and let the compressor stay off until after the glow plugs have cycled.
The +12VDC to the high side of the GPR coil is the same power that goes to the PCM relay and the Fuel Pressure relay. I was thinking of avoiding tapping directly into a PCM output. I was also thinking GPR LED... Just because the GPR coil signal is there, doesn't necessarily mean it does anything. If the radio kicks right on when you turn the key on a cold engine - bad Glow Plug Relay.
It is an automotive accessory timer that a lot of people in the Hayabusa community that upgraded to HID lights have used. When the bike would turn on, the HIDs would ignite. Although, when you push the start button the lights would turn off, then back on in order to produce more power to start the bike. Well, 50% of the time the HIDs would not light back up because of the short on-off-on condition.
Check it out, the part is a DEI 528T Pulse Timer Relay.
It is an automotive accessory timer that a lot of people in the Hayabusa community that upgraded to HID lights have used. When the bike would turn on, the HIDs would ignite. Although, when you push the start button the lights would turn off, then back on in order to produce more power to start the bike. Well, 50% of the time the HIDs would not light back up because of the short on-off-on condition.
Check it out, the part is a DEI 528T Pulse Timer Relay.
I like it but can't seem to find one that is over 15 amps. Fine for a radio, but a tad too light for what I need.
You could use that to pull the coil on a bigger relay.....
Good idea. I just always seem to have bad luck with relays. The last one I put in for the KC lights ended up drawing power down and killing the batteries in her truck.
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