they should have a 30/40amp relay. i got some from radio shack but i dont remember the part number. i just went and looked at them and they dont have a part number on them they only say 12v 30amp

 

Fill me in,... what do these relays do? I am an idiot when it comes these things,...

 

They turn your high wattage compressors on with a low wattage signal from your pressure switch

 

My bad, thanks S10lwrider. Napa has them, but there like 18 bucks, I know I can get them cheaper.

 

the relay gets a 12v signal from your pressure switch. since the pressure switch can't handle having the draw from the comps on it, a relay is used to turn on the comps. The relay sees the 12v when your pressure drops and it allows the other 12v 30 or 40 amp to power the comps without id having to go through the pressure switch. You're probably gonna have to read that a few times because i can't explain stuff that good. i hope i helped

 

Just tell them you are looking for a Automotive Bosch type relay, they will know what it is, and they do have them.

Oh yeah, and they shouldn't be more than 7-8 bucks at the absolute most.


BR549

 

ive bought about 3 from there in the last month in a half. My shit keeps blowing. I forgot to take pics of the last one that was in there....but the cover came off and the inside was black....Maybe its happening cause its exposed to the weather and its been raining bullets lately!

But they are 6.81 with tax where I got them....Just order them online from Jason @ SD or Matt @ Gauge! They are about same price...but you gotta pay shipping!

 

Well, I am looking online since I'm not in the states right now. I think this is it, but my compressors are supposed to pull 35-40 amps when they go over 150 PSI, and this is rated for only 30. Is it gonna work? Thanks!

http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&product%5Fid=275-226

 

They turn your high wattage compressors on with a low wattage signal from your pressure switch

actually its not wattage it amperage

the compressors do have wattage. 746 watts=1 hp Viair 450 comp. =1/4 hp i think so its around 186 watts of power from one 450 compressor. The pressure switch also only pulls like half an amp and the max on the 450 is 23 amps. But u are right but just worded it wrong.

 

But they are 6.81 with tax where I got them....Just order them online from Jason @ SD or Matt @ Gauge! They are about same price...but you gotta pay shipping!

Thanks man, I checked out SSD. Thats cool that they come with the socket harness too. Thanks for the help everybody, happy bagging!

 

30/40 amp relays can be had from www.partsexpress.com for less than $2.00 a piece, also automotive relays are not always effectively sealed so I jump the pressure switch and power to the inside of the cab to prevent burn up.

 

i got a heavy duty relay at the hardware store i used to have a ford starter relay kept burning up on me i just went out and bought a heavy duty worked awesome ever since gave like 15 bucks for it i think

 

Ya ford starter solenoids are not the way to go, they are only made for momentary service, not the few minutes that it takes a compressor to fill up a tank.

Ive bought the bosch style relays from RadioShack before and havnt had any problems with them, but I prefer a name brand DEI relay or something like that from a stereo shop just so I know itll be good.

 

actually its not wattage it amperage

the compressors do have wattage. 746 watts=1 hp Viair 450 comp. =1/4 hp i think so its around 186 watts of power from one 450 compressor. The pressure switch also only pulls like half an amp and the max on the 450 is 23 amps. But u are right but just worded it wrong.

Or you could just multiply the amp draw to the voltage.

P=VxA (ohms law)

 

Or you could just multiply the amp draw to the voltage.

P=VxA (ohms law)

Yea I always remember it as PIE P=IxE

 

Ya ford starter solenoids are not the way to go, they are only made for momentary service, not the few minutes that it takes a compressor to fill up a tank.

Ive bought the bosch style relays from RadioShack before and havnt had any problems with them, but I prefer a name brand DEI relay or something like that from a stereo shop just so I know itll be good.

a relay is a relay is a relay... just make sure you specify a bosch "style" relay, and not an actual bosch relay. an actual bosch relay can go for $20-30, whereas a simple look alike is just a couple bucks. btw, i use ford starter solinoids and they work fine. internaly, that ford starter solinoid IS a bosch style relay, just a little bigger and more heavy duty. if you rip the 2 of them apart, you'll see the same shit inside. a coil, an armature and a magnet. theyre all basicly the same thing. the only thing different you get with a name brand is a tougher (more weather resistant) casing, and the bosch or dei logo stamped on it.

 

I've been running radioshack relays for about 4 or 5 months now and no problems...

 

30/40 amp relays can be had from www.partsexpress.com for less than $2.00 a piece, also automotive relays are not always effectively sealed so I jump the pressure switch and power to the inside of the cab to prevent burn up.

Yeah, I'm gonna mount my tank underneath, but I think I will put my comps in the bed and just run everything down to it. Winter is coming, and I don't think all that salt is gonna be good for it. thanks for the advice everybody!

 

i work at the shack so, thats what i got. I forgot how much it was, but I haven't had any problems with it. its a 30 amp relay.

 

btw, i use ford starter solinoids and they work fine. internaly, that ford starter solinoid IS a bosch style relay, just a little bigger and more heavy duty. if you rip the 2 of them apart, you'll see the same shit inside. a coil, an armature and a magnet. theyre all basicly the same thing. the only thing different you get with a name brand is a tougher (more weather resistant) casing, and the bosch or dei logo stamped on it.

The coil, armature, and magnet are all in the starter.

 

The coil, armature, and magnet are all in the starter.

nooooooooooo! if your mechanic told you that shit, he's ripping you off. there is a starter coil, but thats something different. a starter solonoid is just a big relay made to take the switching load off your ignition switch. its the SAME THING as a standard 5 pin bosch style relay, fool.

 

btw, i use ford starter solinoids and they work fine. internaly, that ford starter solinoid IS a bosch style relay, just a little bigger and more heavy duty. if you rip the 2 of them apart, you'll see the same shit inside. a coil, an armature and a magnet. theyre all basicly the same thing. the only thing different you get with a name brand is a tougher (more weather resistant) casing, and the bosch or dei logo stamped on it.

Ford starter solenoids will NOT work. They are NOT the same, and they are KNOWN to everyone that has EVER tried to use them as failing within 2 months. End of story.

 

Ford starter solenoids will NOT work. They are NOT the same, and they are KNOWN to everyone that has EVER tried to use them as failing within 2 months. End of story.

the reason they fail is cause they either get wet or arent grounded properly. i used them for all kinds of shit in my last car http://members.sounddomain.com/audiounderground and never had a problem. but maybe its just me.

 

i dont see any compressors in that blazer, or anything that would even pull anywhere close to 30amps thru a relay. the setup is nice tho heh

 

nooooooooooo! if your mechanic told you that shit, he's ripping you off. there is a starter coil, but thats something different. a starter solonoid is just a big relay made to take the switching load off your ignition switch. its the SAME THING as a standard 5 pin bosch style relay, fool.

I don't have a mechanic I do it all myself and I have no idea what u are talking about rippin me off. But like Dave said they are only ment to be used for short moments like starters are. Are compressors normally run for 2 minutes plus. I don't think anyone holds there starter for 2 minutes. U need a continous duty solenoid so I guess u are the fool and the one who should talk to your mechanic

The armature is the bigass thing on the starter drive that is moved to engage with the flywheel. The solenoid is normally on the firewall or near the battery.