Use RADIO to turn on accessories with a RELAY! EXPLANATION & WIRING

Use RADIO to turn on accessories with a RELAY! EXPLANATION & WIRING

When building a complex car audio system you may have other accessories that you want to turn on, things like cooling fans, LED lights, and other items. We want these items to be powered whenever our audio system is on, but the radio only provides a small amount of current for its remote turn on circuit. How can we provide much more current? We can use a relay! Here’s how to wire, and use a relay explained!

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50 Comments

  1. Mark on February 1, 2023 at 3:42 am

    Did you ever say which relay you went with that had the built-in diode?

  2. Turbo Duckhead on February 1, 2023 at 3:43 am

    Does Crutchfield cover UK/European cars?

  3. Jon D on February 1, 2023 at 3:44 am

    Links to the relays with diode protection?

  4. T T on February 1, 2023 at 3:44 am

    How do I stop my system from popping on turn on and off?

  5. michael mariano on February 1, 2023 at 3:45 am

    Hi sir can we know the value of a diode that we use in a relay. Thanks in advance

  6. Francisco Botello on February 1, 2023 at 3:47 am

    Whats the name of the distribution box. Cant find one like it?

  7. Sn4p On on February 1, 2023 at 3:47 am

    Crutchfield isn’t any help on my Pontiac G8

  8. adam tineo on February 1, 2023 at 3:50 am

    The relay sockets are only good for certain applications. A spade connector is a much better way to install a relay with no breaks. The pre-wired socket has to have connections made to it. The spade connector wired to relay is direct, no breaks, no solder, no heatshrink, etc.

  9. robis805 on February 1, 2023 at 3:53 am

    Did anyone find the relay with the diode ?

  10. Diego Rossi on February 1, 2023 at 3:55 am

    Hi Mark How are you? I hope that very good
    I want to install my electrical system of amplifiers and DSP but I am confused with the installation of the relay numbers… from what I understood the configuration would be the following:
    30: constant battery power 12v
    87: Amplifier and Accessory Power On
    86: Main unit or DSP remote output
    85:Ground

    The issue is that in other places I see that these settings change, for example:
    87: constant battery power 12v
    30: power on amplifiers and accessories
    86:Ground
    85: Main unit or DSP remote output

    Is the same? Thank you very much for your explanations

  11. Daniel Hayes on February 1, 2023 at 3:55 am

    Where can I find that distribution block for the accessories and relays

  12. Liquid4Style on February 1, 2023 at 3:57 am

    Hi Mark. Why are DSP’s power+rem cables are twisted? Does it really help with noise cancellation? Does it ok to connect RCA near power lines like yours? Thanks.

  13. Daniel Dominguez on February 1, 2023 at 3:58 am

    I’m trying to dive in to designing my own, auto system, with after make stereo and 3×10 subs, 4x tweeters, the front and rear speakers, and there also a center front speaker, question is how many amps do I need, and how would I wire everything exactly?

  14. MikeyB00o on February 1, 2023 at 4:01 am

    Possible to get a link for the relay with the diode?

  15. Johnathan Doe on February 1, 2023 at 4:01 am

    There’s a definite gap in the market for a small solid state power distribution module specifically designed for car audio.

  16. Garrett Giuffre on February 1, 2023 at 4:02 am

    I used relays for a lot of accessories in my time but never have I thought I’m going to use a relay for a remote turn on for power for my amp

  17. TriState Jeeps on February 1, 2023 at 4:04 am

    I’m not gonna lie I wish you were closer to help me install my system. I’m feeling a little overwhelmed lol. And yes I would pay you lol

  18. dank01man on February 1, 2023 at 4:06 am

    Anyone have a like with a relay with a diode built in?

  19. Jamain Wallen on February 1, 2023 at 4:07 am

    Hey, could you post a link for the fused distribution block (the one that the relay is connected to)

  20. 2009KVFD976 on February 1, 2023 at 4:08 am

    I did this on my truck. Running a RF 400.4 and a RF 1200.1 with crossover network. The relay is triggered by the remote turn on and goes to the amps and xover. It also goes to a 100A continuous duty solenoid for ignition hot 6 way power/ground block for other items and another 6 way power/ground block for constant hot items. Works like a champ!

  21. Anthono on February 1, 2023 at 4:08 am

    Please post link with the relay that has the diode already in it

  22. Gale Jenness on February 1, 2023 at 4:08 am

    Wow, I have never seen a relay with a built in fuse before? Now I’m going to have to go hunting for those!

  23. hillbillysamurai on February 1, 2023 at 4:09 am

    Where can I find a relay with spike suppression?

  24. Itz Dixmond on February 1, 2023 at 4:10 am

    Link the relay

  25. S.O.S. Exploration on February 1, 2023 at 4:11 am

    I still get sad at night many years later having to sell off my JL-500.1 monoblock amp. Old school. Bridgeable down to 1/2 ohm stable running 2 HCCA duel Voice Coil subs in my hatchback. Got to love how priorities change however my child is old enough now and is gonna be in her teens soon so gonna get back into adding a system in my project car which stock came with 2 component sets already which will sound even better once I upgrade them and amplify. However as I want 2 keep the weight down I’m only gonna add a really nice hard hitting 12 so supplement overall quality of sound. Should be good for music as well as playing DVDs. Jurassic Park would certainly be sick to watch in a vehicle…

  26. Marlowe Anderson on February 1, 2023 at 4:12 am

    +1 on wanting the diode info.. I’ll keep researching..

  27. Jim O'Dell on February 1, 2023 at 4:13 am

    Where are you getting the relay with fuse and diode from? I can’t find one, but have one without the diode in my near future orders for an update install. Or what value diode would I get to add to the existing wires of the relay socket? Thanks! Enjoying your videos!!!!

  28. Aaron C Hintz on February 1, 2023 at 4:14 am

    Getting ready to install my most complicated system yet after about a decade of being out of the hobby. Your videos have been very helpful in getting ready to do it all the right way. One question: is there a specific reason that you use fuses on the large wire rather than circuit breakers. Obviously, if you install everything correctly, you shouldn’t be blowing fuses. But it seems like a much nicer scenario to just reset a breaker than having to buy and replace the fuse.

  29. Bfraz00 on February 1, 2023 at 4:15 am

    As others have asked, how do we find the correct relay with the “spike/flyback” diode built in? Google-fu is failing to provide answers. I appreciate the videos, but it would be greatly helpful if you provided links to all parts you use when introducing something like this.

  30. samuel cruz on February 1, 2023 at 4:16 am

    What size diode shod be used on 30A-40A four pin relay and socket??.

  31. Jeremy Bradley on February 1, 2023 at 4:16 am

    Now I don’t disbelieve what you are saying, because I know current diminishes with more things needing that current. But why am I able to power, or I should say turn on 5 amps and a dsp off of my headunit?

    Does the headunit matter? It’s a pioneer AVH-2300NEX

  32. Kyle R Huegel on February 1, 2023 at 4:16 am

    I got out of the car audio game for a while just because of unexpected challenges in life but now I’m back and realizing that I’ve missed out on so much in the past 7 years. Thank you so much for creating this channel and helping me get my spark and my enthusiasm about how awesome this stuff is back. I’ve used your videos religiously to create the system of my dreams and I can’t thank you enough. Keep building ✌️

  33. CarAudioFabrication on February 1, 2023 at 4:17 am

    You guys asked for it…So here it is, Enjoy! If you missed the amp rack wiring video check it out here: https://youtu.be/UMAXMWmYX3o Thanks guys!

  34. Anthono on February 1, 2023 at 4:19 am

    Can you post how to wire the diode with the relay

  35. Oliver Whittington on February 1, 2023 at 4:20 am

    Isn’t this what the Phoenix Gold TiDD10 and TiDD5 were doing like 15yrs ago??

  36. Daniel Kuoch on February 1, 2023 at 4:21 am

    Dude, you’re friggin awesome. I continue to learn so much from you. Thank you for creating great content and educating us. 💪🏽

  37. Hennessey 13 on February 1, 2023 at 4:23 am

    So i have 2 questions
    1. Where can i find said special relay??
    2. What size fuse would you recommend for continuing the remote wire

  38. Dyllon Olmstead on February 1, 2023 at 4:24 am

    Crutchfield is awesome I’ve only been using Crutchfield for 10 plus years now.

  39. VCJester on February 1, 2023 at 4:24 am

    Could I safely add a high capacity relay between my amps and battery? My vehicle can sit for 3 months at a time, and I’ve had problems with the amp capacitors draining the battery. I know I could install a disconnect, but I’d like convenience.

  40. Kraze Rush on February 1, 2023 at 4:26 am

    So much info for a newbie lol so here is my dumb question… I have two amps and from what I understand is that I don’t need a relay for this, however I was told if you splice your remote wire and connect it to both amps then one amp will stay on when the other turns off. Anyone wanna help this DA Newbie out??

  41. Mack Haney on February 1, 2023 at 4:29 am

    Hey mark! Can we get a link for the relay with built in flyback diode (spike suppression diode/ freewheel diode) cant find them anywhere!

  42. santoslaguna58 on February 1, 2023 at 4:29 am

    Why would you install something that is going to draw more power from remote turn on. Rather than just connecting it directly to your amp.

  43. Rich B on February 1, 2023 at 4:29 am

    I just replaced my head unit . From older eclipse to a new Kenwood. After the swap now it pops when it turns on and at idle my subs have a rumble . Little rpm everything is smooth . 370 alternator . I have a relay in line . It didn’t do this before I changed the head unit . I really don’t want to go back to old deck . I like the newer one . All the new functions are nice . Any ideas . Probably not best description but hoping

  44. Andy H on February 1, 2023 at 4:32 am

    Mark does the relay increase current flow for the accessories?

  45. Benny Newman on February 1, 2023 at 4:32 am

    what material is used for the amp rack?

  46. Saif A on February 1, 2023 at 4:33 am

    @caraudiofabrication what distribution blocks are you using?

  47. Richard H. Brensinger III on February 1, 2023 at 4:35 am

    Im doing something similar, but a bit overkill, my system is basic, 4 6.5s on a 4 channel amp and a single 10 on a monoblock, also a half din EQ, a 3 way active crossover and a bass distrubution processor. So im getting relays that delay on and or off, im building a 8 channel with digital countdown for each channel, it will allow power down in sequence. I have most of it working, still need a few things but want to pick up a few more timers to see if i can add a turn on sequence as well as off sequence, i have it 1.2 secs between each delay.

  48. Gale Jenness on February 1, 2023 at 4:37 am

    Apparently my new Kia Niro is too new for Crutchfield since their search engine says haven’t got anything on my vehicle yet! That’s a real bummer! Hopefully they will get more on my new car soon?

  49. dank01man on February 1, 2023 at 4:37 am

    Any links for a relay with a diode?

  50. OBS ANT on February 1, 2023 at 4:38 am

    Can u tell me if I have mine wired fine so I don’t gotta worry about a relay going bad and then having to carry relays in my glove box to I have my remote from radio to dsp then from dsp it goes to 2 amps about to be 3 will I still be fine with I’m using 14 gauge to

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