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Thread: How to install a relay for beginners?

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    Default How to install a relay for beginners?

    I am looking for beginner instructions and part list on how to install a relay. Is there a parts list with what voltage relay to buy, what guage wire, posi tap connector, etc. and how to locate the tail light wire to draw the power from? Is there a youtube video to follow? I have heated grips and USB charger that are connected directly to the battery, and I would like both of them and any new future add-ons to be connected to a ignition key controlled power source instead. This would ensure the power to these accessories is cut off when the bike is turned off.

    If there are multiple relays (heated grips, usb charger, etc) would they be sitting in some kind of box housing? What posi-tap connector in terms of tap guage & accessory guage is needed?
    Last edited by fz6rowner; 02-07-2018 at 08:24 AM.

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    Default 12v relays for motorcycle

    12V 40A Wiring Harness Kit 2 Leads LED Work Light Pod Cube ON/OFF Rocker Switch https://www.ebay.com/itm/12V-2Lead-4...dZXzJf&vxp=mtr This harness would provided everything you need to wire a relay for your project. You can shorten the wires where needed. I mounted the switch on the front brake reservoir which worked out perfectly. I installed the relay on the left side behind the seat cowling (you'll see other relays there) make sure the fuse is located as close to the battery as possible for protection of the line. I solder most all of my connections for maximum reliability, but depending on what you are tapping into would determine the connector to be used. I can post pictures later on tonight that show locations.

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    Senior Member blkbrd's Avatar
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    A single pole, single throw relay has 4 terminals. 85&86 are the coil, 30 is common and 87 is normally open (N/O).

    It sounds like you want to make sure that your accessories are not powered when ignition is off.

    To do this, wire it as follows...
    Terminal 85 to ground.
    Terminal 86 to tail light wire.
    Terminal 30 to the positive battery terminal.
    Terminal 87 to the POSITIVE line of your accessory.

    When wired this way your accessory only gets power when the tail light is on.

    I would solder every connection. Posi taps are junk IMO.



    Sent from my SM-G950W using Tapatalk
    2010 Raven FZ6R -- Shogun No-Cut Frame Sliders -- CF Tank Pad -- ZX6 Mirrors -- High Beam Garage Door Opener -- Two Brother's Black Series C/F Exhaust -- Power Commander V -- Galfer SS Brake Lines -- EBC Sintered HH Pads -- Oxford Heated Grips

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    Quote Originally Posted by adazine View Post
    12V 40A Wiring Harness Kit 2 Leads LED Work Light Pod Cube ON/OFF Rocker Switch https://www.ebay.com/itm/12V-2Lead-4...dZXzJf&vxp=mtr This harness would provided everything you need to wire a relay for your project. You can shorten the wires where needed. I mounted the switch on the front brake reservoir which worked out perfectly. I installed the relay on the left side behind the seat cowling (you'll see other relays there) make sure the fuse is located as close to the battery as possible for protection of the line. I solder most all of my connections for maximum reliability, but depending on what you are tapping into would determine the connector to be used. I can post pictures later on tonight that show locations.
    Look forward to the pictures and where the relay draws power from. I dont need a separate on/off switch. just want the power to all the accessories cut off when the ignition key is turned off.
    Last edited by fz6rowner; 02-07-2018 at 08:35 AM.

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    Fuses.jpg

    Power from the battery to the fuses then to the relays.

    Relay.jpg

    I have a lot of different items off of the fuses to power my accessories. I have 10 amp fuses in both holders and all works well. When hooking up the fuse holder/s disconnect the battery first, then go to the lug where the battery runs to, not the battery itself, this will allow you to remove the battery without disconnecting anything else. You can locate anywhere you have room. I cut the cover so I could get to them without having to remove the cover. Relay/s can also be put wherever you have room. The tail light can be used to activate the relay, there is also key on power on the right side of the bike behind the seat cowling in the signal light harness. Figure out where you're going to put everything then plan out how you'll run the wires. The harness on eBay provides all that you need even if you choose not to use the switch.

    Switch.jpg

    This switch I use for the Power Crystal light.

    Cover.jpg

    Cover in place.

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    thanks adazine for the pictures but I still dont get it all. another product description, has this circuit diagram. I assume this is what I get when I buy the product. https://i.ebayimg.com/images/g/ImUAA...Wq/s-l1600.jpg

    Since I wont need the on/off switch button, I would need to connect the wires like this (the blue line shows what I dont need to connect):

    no switch.jpg

    The white wire coming out of the relay is what I need to connect to a ignition key powered source like tail light? In this picture, the two led lights show where I could connect heater grips and a USB charger?
    Last edited by fz6rowner; 02-07-2018 at 08:51 PM.

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    Sorry for the confusion. I should have explained that the harness is just to be used for parts to wire up the accessories. You will need to check on what the heated grips require for proper wire gauge and fuse size to handle the load. Attached picture is a simple illustration of how the relay with the harness would be used to supply power to the grips if the wire size and fuse meets the requirements for this application.

    Diagram.jpg

    Again, the harness would only be used for the necessary parts to wire up the accessory and would require that the wires be cut to fit your needs.

    (The white wire coming out of the relay is what I need to connect to a ignition key powered source like tail light? In this picture, the two led lights show where I could connect heater grips and a USB charger?)

    Yes, basically this would provide two sources to wire in the USB and the Grips, just make sure the grips have the proper wire gauge as I'm not familiar with them.

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    I just looked at your diagram more closely and that is essentially what you would be doing to wire up both items. The reason I recommended this harness is that it supplies the relay, wiring (which has the black covering) and a switch if needed. It's rather inexpensive for all that you get and can be tailored to your needs. Cheers.

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    Senior Member sti491's Avatar
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    Just happened upon your post here. When the slow boat from China finally delivers my jewel light (same as you used we discussed in the other post), and next week when I get the bullet lights for front pods and maybe on the back underseat panels, this is my plan without relays. Please let me know if you think my plan is ok, or if I need a relay.

    I already have a rocker switch installed on my left faring top piece for my power commander map switching, that I am not going to need anymore. For the jewel light, because the switch is proximate to my left turn signal wiring, I am planning to get power from the turn signal running light, route the hot lead through the switch though the switch if I need to turn it off at night (if too bright for oncoming traffic). That way the jewel will be on as a DRL along with my signals, unless I turn the switch off. Do you think that is safe, not putting too much juice through the switch without relay? I also did not think I needed a separate fuse, because the turn signal DRL is already fused. Can you confirm this is acceptable?

    As far as the 3 wire bullet LED's go, I was just going to wire them directly to my front flush aftermarket signal wires, and my tail light. Good set-up like this?

    Appreciate your help. I can do basic wiring and use a multimeter, solder, etc...but I not very familiar with these types of LED lighting additions and the electric load they draw.



    Quote Originally Posted by adazine View Post
    I just looked at your diagram more closely and that is essentially what you would be doing to wire up both items. The reason I recommended this harness is that it supplies the relay, wiring (which has the black covering) and a switch if needed. It's rather inexpensive for all that you get and can be tailored to your needs. Cheers.

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