can anyone tell me the best way to wire up my train horns to a switch? i had them professionally installed and they wired it directly to the ignition, so i have no control at all, i just want to be able to flip the switch when i want to. there is a 30/40 amp relay with 4 prongs on it. one come from the battery with a 30 amp fusable link, ones grounded out to the body, one to the ignition and the last one heads down to the compressor. if anyone has a diagram or can explain instructions very well to a wiring retard that would be awesome!

 

the wire that goes to the ignition, cut that and run two lenghts of wire to the cab, tie them into an on or off switch, this will cary little voltage so as not to have to worry about a lot of draw, and flipping it to foff will just flat out disable it. sooooooo where you cut that ignition lead, tie on one new length, run to new switch, from other leg of switch go back and tie in to other end of wire cut earlier... clear as mud ?

 

i think i got you...cut the wire that runs to the ignition.. run the wire i cut to a switch, then run another wire off the other post of the switch to where i cut the lead.. i think.. well do i really need the relay deal? cant i just run the fusable link from the battery to the switch, and on the other leg of the switch, run a wire to the positive wire on the compressor? i shouldnt need the relay if i got a 30 amp fuse at the battery right?


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well just letting yall know i figured it out. i just pulled the relay off the truck. cut the ignition wire and ran one wire from the inline fuse to the switch and another wire from the switch to the compressor.. now i can control when i want the compressor on

 

you might want to keep that realy in there. Those switches are probably NOT designed to carry the amp load for that compressor. On top of that the wires you used probably arent for the AMP load of the compressor. The relay was to keep all the wires running to power things out of your cab and away from your fingers.

What you should have done is either simply wire a switch in the wire that went to the ignition OR run a fused switch to the battery. That way, the ONLY juice going through the switch is just enough to close the relay.

Just throwing it out there. I would hate to read about another truck burning up due to electical fire.

 

you should keep that relay in there, let it handle the power, not the switch...... the way I explained and you understood keeps only low power draw on the switch, for safety you could run a 5 amp fuse on that lead.