hey guys ,newbie to the forum so forgive me if it this is not posted in the correct place.just a quick question,i have a problem with my pressure switch.one morning i emtied my tank filling a tire and compresser would not cycle on so i figured it was the pressure switch,so i ordered a new one and hooked it up with truck off but key turned to power compresser and it went on,not wanting to drain my battery i turned truck on and pressure switch died immediatly.could something be killing my pressure switches all of a sudden?i had no problems for 9 months and now in one week i have lost two pressure switches.thanks for looking.by tyhe way it is a viar 480 c and viar 200psi switch with relay
check your ground. if the ground is bad it will work when it wants… turn truck on and jiggle ground wire around , especially around ground point to frame…
i checked for ground and everything is good ,the switch clicks but compresser does not run, compresser runs when hooked to straight power.the switch is bad but i dont know why i would kill two in one week ,and no problems before
^ What switches are you buying? I went through a handful of them. I finally bought a Viair 110/145 from HornBlasters and have not had a problem since.
it is a viar 165 on 200 off with built in relay,it worked when key was in aux ,but as soon as i turned on truck switch cut out,now nothing either way
^ You may have something wired wrong…
The horns have always been wired exactly the same, never have I had a problem until now
^ Not to say that some corrosion or lose connection somewhere could be the problem?
What compressor are you running?
^^^
Must have missed that… sorry.
The relay inside the gray box is rated to 30 amps max. How far is the compressor from the battery, and what gauge wire are you running?
If too far, you will experience voltage drop and amp spike - which will blow fuses.
Additionally, you could have a check valve that isn’t sealing completely, which may be causing the head to load with 200 PSI - which can also cause an amp spike that is capable of blowing your fuse.