Results 1 to 3 of 3

Thread: 40 Amp Fan Relays - Dual Speed

Hybrid View

Previous Post Previous Post   Next Post Next Post
  1. #1
    Super Moderator dave w's Avatar
    Join Date
    Feb 2011
    Posts
    6,350

    40 Amp Fan Relays - Dual Speed

    Pictured below is a 40 Amp Fan Relay Module - Dual Speed

    Build Details below.

    https://catalog.waytekwire.com/Wayte...talog-232/179/

    Fan wires are 10 AWG
    Primary Ground wire is 8 AWG
    Primary Battery + wire is 8 AWG

    dave w


    IMG_1809.jpg

    IMG_1810.jpg

    Attachment 15941

    IMG_1813.jpg

    IMG_1811.jpg

    IMG_1812.jpg
    Attached Images Attached Images
    Last edited by dave w; 08-02-2020 at 11:54 PM.

  2. #2
    Administrator
    Join Date
    May 2011
    Location
    Lakes Region, NH
    Age
    54
    Posts
    3,870
    That's a pretty handy setup. Thanks for posting that.

    With 40A relays we've found the terminals can get hot with extended use. Our fleet applications probably are more demanding than the average vehicle but if you are going to be using the relays at near-peak current capacity it might improve reliability to split the current across multiple relays.

  3. #3
    Super Moderator dave w's Avatar
    Join Date
    Feb 2011
    Posts
    6,350
    Quote Originally Posted by 1project2many View Post
    That's a pretty handy setup. Thanks for posting that.

    With 40A relays we've found the terminals can get hot with extended use. Our fleet applications probably are more demanding than the average vehicle but if you are going to be using the relays at near-peak current capacity it might improve reliability to split the current across multiple relays.
    I agree, a constant 40A current draw will get relay terminals warm or possibly to hot to touch. Many GM Fan Relays are 0.125" terminals. The relays selected are 0.250" terminals. The box was built for a competition Off Road application.

    dave w

Similar Threads

  1. LS1 Ignition On & Start Relays
    By dave w in forum OBDII Tuning
    Replies: 10
    Last Post: 10-13-2018, 05:53 PM
  2. Quick dual TBI question
    By trippyjoey in forum GM EFI Systems
    Replies: 8
    Last Post: 12-11-2014, 06:42 AM
  3. LT1 8051 dual wideband into PCM?
    By sherlock9c1 in forum GM EFI Systems
    Replies: 1
    Last Post: 05-29-2014, 05:37 AM
  4. $OE dual fan control
    By Nasty-Z in forum GM EFI Systems
    Replies: 22
    Last Post: 05-12-2013, 05:38 PM
  5. Dual Air Intake Setup
    By mudbuggy in forum GM EFI Systems
    Replies: 1
    Last Post: 04-29-2012, 03:05 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •