Trigger wire for relay in fuse box

[m3f_eatsleepla_cd8297af17]

I'm looking for a trigger wire in the engine bay fuse box, thats on when the car is on, so Hot in Run and Start. Can anyone help me with a color wire they used, its a relay for lighting. I keep finding guides for e46's and they use the starter wire, but i'm not sure how that translates to an e36.



I tried tapping fuse 46, which i thought was Hot in run and start, but its not apparently as it fails to trigger the lights yet when i touch the trigger wire to the battery terminal in triggers the lights. I have a 1997 3.2L m3.

[m3f_eatsleepla_cd8297af17]

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[m3f_pbonsalb_ba5494e5cb]

I think the top (towards the engine) fuse in the left hand row will work for a tap for this purpose. There are probably others. You may have to pull the spare fuse in the lid immediately above this location if using a double sideways fuse tap to make clearance for the lid to snap closed.

[m3f_eatsleepla_cd8297af17]

I wasn't gonna use a fuse tap, I was planning on using a wire tap inside the fuse box. Which would be better.


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[m3f_eatsleepla_cd8297af17]

Bump


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[m3f_WRXEATR_c6f1d80be6]

Bentley is flooding with diagrams showing hot in run and start.....take a look.

[m3f_eatsleepla_cd8297af17]

Bentley is flooding with diagrams showing hot in run and start.....take a look.


This is the my first time reading one of these diagrams, so can someone help me out. On page ELE65 and the second diagram down for the 1997 M3, towards the top right it says Hot in Run and Start. Is it refering to just Fuse 28 or also fuse 45? and if its both, do i just tap into the colored wires listed below, so Violet/White for fuse 45 or Green/Gray for Fuse F28?

correct me if im wrong, but i think the amps/ voltage doesnt matter as its a trigger wire, not the actual power source.


For a little background, i used a relay and tapped the first trigger wire into the passenger dome lights and tapped the second trigger wire into fuse #46, as a read somewhere else. But now the lights come on when the interior lights come on (even without the fuse???) yet when i start the car the lights go out...

[m3f_pbonsalb_ba5494e5cb]

trigger will draw next to nothing. I think it is best to tap as a trigger and to pull your power from the heavy gauge power terminal next to the fusebox and cut a passageway through the box for a wire. With the fuse taps, you can draw power, though I am using mine as a trigger. I did not feel like splicing properly and do not like to use quick taps.

[m3f_eatsleepla_cd8297af17]

trigger will draw next to nothing. I think it is best to tap as a trigger and to pull your power from the heavy gauge power terminal next to the fusebox and cut a passageway through the box for a wire. With the fuse taps, you can draw power, though I am using mine as a trigger. I did not feel like splicing properly and do not like to use quick taps.



i know thats why im using a relay. The power is being taken from the battery terminal under the hood, and i have the first trigger wire going to the dome lights, and i need to know where i run the second trigger wire to so that the lights come on in run/ start

[m3f_pbonsalb_ba5494e5cb]

Why two trigger wires? I guess I don't understand what you are trying to do.



With the typical relay, 30 is unswitched power, 85 is relay power (trigger), 86 is relay ground, 87 is output power (device run by relay). 87a on a dual pole relay (5 prong) is output power until 87 is triggered by the relay or vice versa. 85 and 86 are actually interchangeable and either can be ground or power. You can also trigger via a ground instead of via power if that is easier for a particular system.

[m3f_eatsleepla_cd8297af17]

Why two trigger wires? I guess I don't understand what you are trying to do.


With the typical relay, 30 is unswitched power, 85 is relay power (trigger), 86 is relay ground, 87 is output power (device run by relay). 87a on a dual pole relay (5 prong) is output power until 87 is triggered by the relay or vice versa. 85 and 86 are actually interchangeable and either can be ground or power. You can also trigger via a ground instead of via power if that is easier for a particular system.


I have a relay which has the following connectors; positive battery terminal, negative battery terminal (chasis), trigger wire 1, and trigger wire 2. Trigger wire 1 goes into the interior and taps into the interior lighting so that when the interior lights are on the relay is switched on. Thus the relay is triggered when the car is unlocked, or a door opens, ect. Then trigger wire 2 is to trigger the relay when the car is on. So your saying 85 is a switched power that I can connect my trigger wire up to?


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[m3f_pbonsalb_ba5494e5cb]

I have never wired anything like that. I am sure it is possible somehow, maybe using both poles of a dual pole relay, but am not sure. If not, you may need two relays. The normal use of the 4 or 5 prong relay is as I described.

[m3f_epj3_d2e882815a]

Washer fluid pump is switched if that helps. This is where my city lights relay gets its poweerrrrr

[m3f_eatsleepla_cd8297af17]

I have never wired anything like that. I am sure it is possible somehow, maybe using both poles of a dual pole relay, but am not sure. If not, you may need two relays. The normal use of the 4 or 5 prong relay is as I described.


I think your misunderstanding. It is a relay harness from a vendor. My question is just which colored wire to tap in the fuse box, not how to wire it. The wiring for the relay is all done for me. I was just asking if anyone knows a good fuse to tapp


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[m3f_eatsleepla_cd8297af17]

Washer fluid pump is switched if that helps. This is where my city lights relay gets its poweerrrrr


Thanks, ill try that. Did you use a fuse tap or a wire tap when you open the bottom section of the fuse box (not just the cap) Do you know what fuse or color wire it is btw?


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