Best Relay Trigger Wire?

[CJDMOON]

Main Question I was planning on using the tail light wire to trigger the relay for a Blue Sea under the seat fuse block install. I have read a forum post mentioning the magic blue wire that deactivates when the starter is engaged. How do I find this magic wire? Is it a better choice? Secondary question. Does anybody use the 87A on the 5 post relay for their battery trickle charger or anything else? Thank You

 

[03HiYoSilver]

CD.

Not sure if this is exactly what you want, but this link may help you with your goals:

https://www.fjrforum.com/forum//index.php?showtopic=127652

 

[CJDMOON]

Thank You HighYoSilver, Unless somebody has a better way my first questions appears answered. I now plan to use the heated grip wire for the trigger. I will try to locate it, a more more detailed description in locating the wire would be greatly appreciated. Thanks