Space I hope to get more info as to what is need . I rebuild alot of fuse blocks on mail trucks ..They burn out the hazard fuse alot because they use them..

It's feed it power from the battery.

 

thanks for replies and im sorry my question was vague, i know it receives power from the battery i need to know which one and where is the main power wire?

 

only straight wire from Big bat term on starter runs thru firewall to a switch, power wire from that same post on same switch ran to seperate starter switch. other post on "power" switch ran to fuse box BATT slot, other post of "starter " switch ran to starter solenoid. my box only received power (lights, signals etc) when "power switch" was on and ignition was in on position. Now with both switchs on i have no lights, no nothing. my main mindboggle here is where was my fuseblock receiving power? I ran that main wire from BATT term on starter to the wire running to the BATT slot to see if that theory was correct and results were still no power. This leads me to beleive that acted as a ground? and the power was from ignition being turned on?? The only reason i know both the "power" switch and ignition were required for fuse block activation was no lights unless both on and my elec fuel pump is wired to IGN slot on fuse block

 

Have no power to fuse block, please dont get lost. Thank to reply on here I now know 2 red wires in harness are supposed to deliver that power (constant and ign on) and are supposed to be wired to starter BATT term but my only straight wire from Big bat term on starter runs thru firewall to a switch, seperate power wire from that same post on same switch ran to seperate starter switch. other post on "power" switch ran to fuse box BATT slot, other post of "starter " switch ran to starter solenoid. my box only received power (lights, signals etc) when "power switch" was on and ignition was in on position. Now with both switchs on i have no lights, no nothing. my main mindboggle here is where was my fuseblock receiving power? I ran that main wire from BATT term on starter to the wire running to the BATT slot (previoslu on bottom of "power" switch) to see if that theory was correct and results were still no power. This leads me to beleive that wire acted as a ground for my "power" switch and the power was from ignition being turned on?? The only reason i know both the "power" switch and ignition were required for fuse block activation was no lights unless both on and my elec fuel pump is wired to IGN slot on fuse block, need help bad, THANK YOU

 

Have no power to fuse block, please dont get lost. Thank to reply on here I now know 2 red wires in harness are supposed to deliver that power (constant and ign on) and are supposed to be wired to starter BATT term but my only straight wire from Big bat term on starter runs thru firewall to a switch, seperate power wire from that same post on same switch ran to seperate starter switch. other post on "power" switch ran to fuse box BATT slot, other post of "starter " switch ran to starter solenoid. my box only received power (lights, signals etc) when "power switch" was on and ignition was in on position. Now with both switchs on i have no lights, no nothing. my main mindboggle here is where was my fuseblock receiving power? I ran that main wire from BATT term on starter to the wire running to the BATT slot (previoslu on bottom of "power" switch) to see if that theory was correct and results were still no power. This leads me to beleive that wire acted as a ground for my "power" switch and the power was from ignition being turned on?? The only reason i know both the "power" switch and ignition were required for fuse block activation was no lights unless both on and my elec fuel pump is wired to IGN slot on fuse block, need help bad, THANK YOU