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Energise an aftermarket relay (Pin 86) from car's stock Ignition/Power Window Relay?
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dfinto
New User
Jan 25, 2024, 7:57 AM
Post #1 of 4
(3795 views)
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Energise an aftermarket relay (Pin 86) from car's stock Ignition/Power Window Relay?
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This is the schematic I came up with. It's on the upper right hand corner. The images to the left and bottom gives a quick glance of the car's (Mid 2000s Corolla) wiring diagram.
https://i.imgur.com/U0SJVfP.png
The car only has two connections on the fuse box (interior and exterior) that will only send current when key is ACC position. I.e. even when there's no key in the ignition, all the other fuses will send power to said devices, leading to battery drain.
I would like to leave the 2 fuse connections alone, in case I need to urgently add more electrical devices in the future (time is not an issue right now).
Unfortunately I haven't come across any guide or forum post detailing drawing said current from factory added/included relays, i.e. 'switched accessory power 12v'.
Logic has told me, find one wire that paired with one of the factory relay's '87 pin', #3 in this case for manufacturers relay diagrams; do a multimeter test on said wire when key is in desired position (ACC, On/Run, or Start), then use a T-Tap or solder on said wire, and link it to my aftermarket relay's '86 pin'.
As seen in the image, some of the wires would most likely be those connected to 'pin 3' of the factory relay:
Connector IL wire on Pin #7 IC Pin #11 IC pin #9 IF Pin #11
Just wondering if anyone's encountered this and how they chose to go about this.
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Hammer Time
Ultimate Carjunky
/ Moderator
Jan 25, 2024, 8:08 AM
Post #2 of 4
(3793 views)
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Re: Energise an aftermarket relay (Pin 86) from car's stock Ignition/Power Window Relay?
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This whole idea sounds insane.
There is no possible reason to modify this wiring. Things that are powered all the time are done so for a reason and there should be nothing killing a battery. If you have a parasitic drain when the car is parked, then you need to find the source of of this drain.
You have no idea how much trouble you can get in trying to modify factory wiring.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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dfinto
New User
Jan 25, 2024, 9:31 AM
Post #3 of 4
(3769 views)
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Re: Energise an aftermarket relay (Pin 86) from car's stock Ignition/Power Window Relay?
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I want to add devices that only turn on when the key is in the ACC or ignition ON.
Are you saying the only practical/rational solution is to use one of the two fuses (each limited to 15A) that only energise when key is at the ACC/ON position?
I don't want to rely on a manually operated on/off switch as I may forget to turn on said dash cams when I need it most.
I've already asked on another forum dedicated to this car model, and the fact the rest of the fuses are supplying power to auxiliary (add-on device) when car is off is 'Normal', not a parasitc drain.
(This post was edited by dfinto on Jan 25, 2024, 9:32 AM)
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