running 2 compressors of one wire ?

yes one 60a fuse on the 8 ga (60 a is really pushing it for 8 ga) and 30 on each 10 ga.

ok cool.. i got that now... im gunna come off with 8 then fuse them then run to the relays then back to a fuse by the compressors then to the compressor... so now.... does that fuse coming off the 8 guage need to be a 60 amp fuse or what amperage does it need to be?

60 pushing it as in too much or too little?

id run both comps of a starter style solienoid(mine is 100 amp 100% duty) run the 8 gauge to it then run dual 10 gauge from there. thast the way mine was ran with 2 thomosa 315s a couple years ago.it was ran strait from the battery, tappin the fuse box for anything other than the radio is a no no.

Originally posted by Dejavu



60 pushing it as in too much or too little?

60a continuous draw would be quite a bit for 8 ga, I would fuse it at 50a since cris said the max draw of Viairs is ~23a each... then fuse the comps at 25 each.

the reason i said the too little part is because i think these comps are max draw of 23 amp.. so that makes 46 amps max pull..... 60 leaves a lot of room for error huh?

Edited: 1/17/2006 2:54:45 PM by Dejavu

yea thats what i was thinkig...thanks so much for the quick help duders.. thats why i freakin love this site

i think those pressure switch/relay combos run about 25 bux, not exact on the normal retail, but unless you want to ruin your warranty, you shoulda bought a viair pressureswitch/relay with the comp because viair has some b/s about needing them both on the same receipt to warranty.

simplify this, cause he's not understanding.

DO NOT RUN COMPRESSORS OFF OF YOUR STOCK FUSE BLOCK!!! that's asking for problems. here's your best (and safest) bet:

using an 8 gauge or 4 gauge wire run a new lead from the battery (install an inline fuse or 80 amp circuit breaker (recommend the circuit breaker) off of the battery (within 6-8 inches of the + termianal. Run the new lead (below the vehicle, but above the lowest part of the frame, (keeping it away from exhaust and any abs sensors)to the rear of the truck. then add a dual fuse block (car audio type will work fine) which holds either 8 or 4 gauge connections and run the power to your compressors. Fusing it in the front at the battery prevents any shorts from killing your vehicle and setting it on fire. Fusing it in the rear will prevent any short in between the two fuses or at the comressors from damage, fire etc. You should always use the same size ground as you do power cable. ground each compressor with as short of a wire lead as possible (8-10" is ideal) tie in your pressure switches and your good to go.

^^ the pressure switch wont last long with 20+amps running through it. you need to setup some sort of relay for the pressure switch to trigger on. if its confusing just do like i said, run the fused power wire (8 ga) from the battery, hook the viair pressure switch/relay to it, hook up all labeled wires, boom you're done.