I am installing a battery isolation solenoid on my 2007 Chevy 1500 truck and I would like to know the best place to tap into an ignition switched wire under the hood to energize the solenoid.
I would say wire it too the ignition on side of the switch and this is why .
1 Not only would the battery be isolated automatically, the circuit would be
locked out when the key is removed, redundant battery isolation.
2 It would auto isolate the battery when the ignition it tuned
off, by dropping the path to the relay. Making the procedure of start
up, two functions, key on and the press button to activate the battery
isolation relay .
Remember that 2007 has a few preset or memorized items. When batteries are replaced in the newer style cars there are items that are reset to a base standard when all the power is removed . Clocks, computer engine mapping, oil change alerts, these types. So it just might not be a good idea to isolate that battery like you have in mind. Before computer monitored cars came along the only remembered function were a few preset radio stations .. not the case in todays cars.
I agree with Pepi, but make sure that soleniod is rated for continuous energized duty.
I should explain what I'm intending to do, the battery I want to isolate is on the trailer I'm pulling so that when the engine is not running there is no drain from my truck battery killing it.
Ok then what I said in the first post will work just fine , wire it to the on side of the ignition switch .
I think your GM truck has a fairly large fuse box mounted under the hood. You just need to find one of the fuses that is live with the ignition on, and tap into that source.
You can use a Fuse-Tap device to connect it to the fuse itself and run a wire to activate the relay. This is what I'm talking about, and its sold by Bussman. I found it at one of the auto parts stores - maybe Pep Boys.
It would be better to find the actual wire to tap into instead of the fuse box, but without a color-coded wiring diagram that might be tough to do.
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