the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

Where can I find heavier relays, 80 amp?


Post ReplyPost New Topic
< Prev Topic Next Topic >
mn12sc35th 
Member - Posts: 6
Member spacespace
Joined: October 20, 2006
Location: United States
Posted: October 20, 2006 at 7:59 AM / IP Logged  

I've got an electric fan mounted (a spare from another car I have). The thing is a 2 speed fan, and it pulls a pretty decent load (eats 30 amp fuses instantly, I'm told it draws around 60-70). I have the low speed run through a controller, but I'd like to run the high speed to a switch. The problem there is that both sides cannot be running at once or it will burn it up. I've made a standard 30 amp SPDT relay work, but I'm worried about it burning that up. I'd rather have something I know will standup to it. Anyone have a source for a relay that's rated around 80 amps?

the12volt 
Administrator - Posts: 3,955
Administrator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spaceThis member has been recognized as an authority in Mobile Security and Convenience. Click here for more info.spacespace
Joined: March 07, 2002
Location: Louisiana, United States
Posted: October 20, 2006 at 8:28 AM / IP Logged  
KPierson 
Platinum - Posts: 3,527
Platinum spaceThis member consistently provides reliable informationspace
Joined: April 14, 2005
Location: Ohio, United States
Posted: October 20, 2006 at 2:17 PM / IP Logged  

Wire 30A relays in parallel.  That will probably be your cheapest and easiest solution.

When wiring contacts in parallel you add their current capabilities together.

Kevin Pierson
auex 
Platinum - Posts: 5,041
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spacespace
Joined: December 23, 2002
Location: Arizona, United States
Posted: October 20, 2006 at 5:58 PM / IP Logged  
Probably should get a small solenoid for that much power.
After looking, this is pretty much what volt posted.
Certified Security Specialist
Always check info with a digital multimeter.
I promise to be good.
Tell Darwin I sent you.
I've been sick lately, sorry I won't be on much.
Ween 
Platinum - Posts: 1,364
Platinum spacespace
Joined: August 01, 2004
Location: Illinois, United States
Posted: October 20, 2006 at 7:21 PM / IP Logged  

hi,

bosch has 75A relays .... available on ebay for around $25 with shipping.

mark

mn12sc35th 
Member - Posts: 6
Member spacespace
Joined: October 20, 2006
Location: United States
Posted: October 20, 2006 at 10:42 PM / IP Logged  

Thanks for your suggestions.

On that PAC-80, it's hard to tell by the pictures (even downloaded the pdf manual), but does it have both the open and closed outputs? The relays I found on ebay all lack the open output (the 87a pin, as do pretty much all of the relays you can buy locally it seems...).

Being that I can only have 1 on at a time or risk burning it up, the most obvious way to me was to use the closed output (87) to run the high speed, and the open (87a) to run the low speed controller. I could do this with a couple relays in parallel though, I hadn't even thought of that.

1998chevy1500 
Copper - Posts: 66
Copper spacespace
Joined: March 12, 2003
Location: United States
Posted: October 21, 2006 at 2:06 AM / IP Logged  
I'm going to go out on a limb here and guess with the current draws and the 2 speed functionality you are using one of the Taurus fans. A good place for quality relays is http://www.waytekwire.com/
Also this should help you out with your wiring problem http://www.offroad-tech.com/forum/showthread.php?t=2224
mn12sc35th 
Member - Posts: 6
Member spacespace
Joined: October 20, 2006
Location: United States
Posted: October 21, 2006 at 7:22 AM / IP Logged  

Close.... it's from a T-Bird SC. From the look of those pictures, it's the same fan except the shroud on my fan is smaller (the SC uses a thicker, skinnier downflow radiator to make room for an intercooler). I had an extra one to slap on my base model T-Bird. Sounds like it draws about the same amperage too. The stock alternator on this thing is only a 75amp, so the voltmeter made me nervous at idle the first few times... I have a 3.8 mustang engine around here, and those have 130 amp alts, so I'm going to see about it next. It'll require a little rewiring though, as my stock one has a plug for the B+ output rather than a post (and it has 2 B+'s on that plug....).

That diagram looks like a better option. I essentially had mine going the same route through that center relay, just needed to go one step further (adding the bigger relays after it). Just have to add my fan controller between the low speed output and the fan itself and I'm good (don't want the fan running all the time, takes too long to warm up if I do). Thanks.

Mad Scientists 
Silver - Posts: 380
Silver spacespace
Joined: February 07, 2004
Location: United States
Posted: October 21, 2006 at 9:49 AM / IP Logged  

Have you looked to see how Ford controlled it?.. On those, there's usually a control module mounted to the radiator support that has a bunch of relays in it.. you could use that if you got the wiring diagram for it.

Jim

mn12sc35th 
Member - Posts: 6
Member spacespace
Joined: October 20, 2006
Location: United States
Posted: October 21, 2006 at 2:16 PM / IP Logged  
I do have the diagrams for it, that module you're talking about (the Intregrated Relay Control Module) is essentially 3 relays, but it uses a signal from the ECU to actually turn the fans on and off. I considered that, but I dont have an extra one, and I think one would cost a little more than 3 relays would.
Page of 2

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Friday, March 29, 2024 • Copyright © 1999-2024 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer