Beefy Horns
#32
Ah ok. Horn plug meaning the plugs that connect directly to the horn right? As for the ground on the relay, that should be 8 gauge as well correct? Also, just to verify, I change the fuse for the horn as well as the horn relay to say 30A if I go with the 5 horns in addition to a 30A relay that will handle all the wires and splitting and whatnot.
#33
#35
Originally Posted by ttrank
Each horn can have its own ground which can be the oem wire size. The 8ga is because one large power wire is feeding all the horns.
You don't change the oem wiring or fuse. You need to run a new power wire from the battery with a new fuse and fuse holder to the relay.
You don't change the oem wiring or fuse. You need to run a new power wire from the battery with a new fuse and fuse holder to the relay.
#36
Here's a wiring diagram that shows the horn circuit. The parts in question are highlighted in red.
As Texasscout and ttrank have said, you don't need to modify the OEM wiring. You'll just need to tap into the horn trigger wire which, in the diagram, attaches to pin 1 on the horn relay.
Also, since each horn will be grounded separately, and each horn only draws a max of 5 amps, the ground for each one only needs to handle that much current draw. That's why they don't all need 8 gauge ground wires.
Edit: I should probably mention that I stole the wiring diagram from the Factory Service Manual so graciously hosted by EricIsKlumzyee. There is a link to it in this thread:
https://g35driver.com/forums/faq-diy...df-format.html
As Texasscout and ttrank have said, you don't need to modify the OEM wiring. You'll just need to tap into the horn trigger wire which, in the diagram, attaches to pin 1 on the horn relay.
Also, since each horn will be grounded separately, and each horn only draws a max of 5 amps, the ground for each one only needs to handle that much current draw. That's why they don't all need 8 gauge ground wires.
Edit: I should probably mention that I stole the wiring diagram from the Factory Service Manual so graciously hosted by EricIsKlumzyee. There is a link to it in this thread:
https://g35driver.com/forums/faq-diy...df-format.html
Last edited by jimrockford; 09-29-2008 at 11:29 PM.
#37
Registered User
iTrader: (11)
I just ran a #8 wire, fused for 30 amps, from the battery to the horn area. I came off the Green Red (G/R) wire in the horn plug using a spade terminal and went to the coil of the relay. From there to ground. then the hot from the battery to the points and from the points thru the air pump of the horns to ground. You don't need to change the fuse to anything bigger. In fact I ran the thing direct using the factory wiring for a while but the voltage drop was just too much and the horns were not that loud. With the extra relay, it will get some real attention.
#38
#40
#41
Maybe my issue is the horn trigger wire and I am thinking I have the correct one hooked up. Is the horn trigger wire the one that is the positive wire that connects to the OEM horn? If not, where is the horn trigger wire?
I think that's the problem, because the horns are not loud as they should be. That original fuse is still limiting the power these horns should see.
I think that's the problem, because the horns are not loud as they should be. That original fuse is still limiting the power these horns should see.
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