The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1947 - 1959 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 06-26-2013, 09:27 AM   #1
focusedontheprize
Registered User
 
focusedontheprize's Avatar
 
Join Date: Feb 2012
Location: CA
Posts: 846
Electric fan wiring issue

In my '49 I am currently running a 2 speed older Taurus/Sable fan. I am also running a 21 circuit EZ Wiring harness throughout the truck also. The truck is outfitted with LED turn signals and tail lights.

There really isn't much pulling for power on the harness I believe (my uncle is doing the wiring on the truck). Everything is hooked up at the moment except the fan and it seems every time he tries to run the fan he blows a fuse.

How did all of you guys running electric fans hook them up?
focusedontheprize is offline   Reply With Quote
Old 06-26-2013, 09:40 AM   #2
mknittle
Registered User
 
mknittle's Avatar
 
Join Date: Jul 2011
Location: Auburn ca.
Posts: 2,886
Re: Electric fan wiring issue

Some of the higher amperage fans run a relay.
__________________
Mark

My GMC build.
http://67-72chevytrucks.com/vboard/s...d.php?t=536602

Last edited by mknittle; 06-26-2013 at 09:47 AM.
mknittle is offline   Reply With Quote
Old 06-26-2013, 09:51 AM   #3
focusedontheprize
Registered User
 
focusedontheprize's Avatar
 
Join Date: Feb 2012
Location: CA
Posts: 846
Re: Electric fan wiring issue

Quote:
Originally Posted by mknittle View Post
Some of the higher amperage fans run a relay.
Thanks. Yeah at the moment he has a relay in the loop. He said last night he tested it and when the relay is in the circuit (think that is the proper term) the fan does not work, however when he bypasses the relay the fan works fine.

Also thanks for the diagram, I will send that over to him.
focusedontheprize is offline   Reply With Quote
Old 06-26-2013, 10:03 AM   #4
mknittle
Registered User
 
mknittle's Avatar
 
Join Date: Jul 2011
Location: Auburn ca.
Posts: 2,886
Re: Electric fan wiring issue

Quote:
Originally Posted by focusedontheprize View Post
Thanks. Yeah at the moment he has a relay in the loop. He said last night he tested it and when the relay is in the circuit (think that is the proper term) the fan does not work, however when he bypasses the relay the fan works fine.

Also thanks for the diagram, I will send that over to him.
You're welcome. sometimes you find god info in the strangest places
__________________
Mark

My GMC build.
http://67-72chevytrucks.com/vboard/s...d.php?t=536602
mknittle is offline   Reply With Quote
Old 06-26-2013, 09:50 AM   #5
mknittle
Registered User
 
mknittle's Avatar
 
Join Date: Jul 2011
Location: Auburn ca.
Posts: 2,886
Re: Electric fan wiring issue

I found this on a Taurus forum
Attached Images
 
__________________
Mark

My GMC build.
http://67-72chevytrucks.com/vboard/s...d.php?t=536602
mknittle is offline   Reply With Quote
Old 06-26-2013, 10:32 AM   #6
Rufton
Registered User
 
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
Re: Electric fan wiring issue

I've experienced relay failure; the relay contact developed a white crust. Now I run redundant relays, redundant switches and redundant fuses. Occasionally, I verify both high current circuits are functioning; which reminds me I need to check em.

You probably know a relay can allow a low current circuit to trigger a separate high current fan circuit. I do have fan rated fuses in the high current circuits.
Rufton is offline   Reply With Quote
Old 06-26-2013, 02:20 PM   #7
focusedontheprize
Registered User
 
focusedontheprize's Avatar
 
Join Date: Feb 2012
Location: CA
Posts: 846
Re: Electric fan wiring issue

Quote:
Originally Posted by Rufton View Post
I've experienced relay failure; the relay contact developed a white crust. Now I run redundant relays, redundant switches and redundant fuses. Occasionally, I verify both high current circuits are functioning; which reminds me I need to check em.

You probably know a relay can allow a low current circuit to trigger a separate high current fan circuit. I do have fan rated fuses in the high current circuits.
Yep. Relay failure it was . Ah Pepboys .
focusedontheprize is offline   Reply With Quote
Old 06-26-2013, 07:20 PM   #8
Rufton
Registered User
 
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
Re: Electric fan wiring issue

Quote:
Originally Posted by focusedontheprize View Post
Yep. Relay failure it was . Ah Pepboys .
Did you dissect it outta curiosity?
Rufton is offline   Reply With Quote
Old 06-26-2013, 09:48 PM   #9
mknittle
Registered User
 
mknittle's Avatar
 
Join Date: Jul 2011
Location: Auburn ca.
Posts: 2,886
Re: Electric fan wiring issue

Quote:
Originally Posted by Rufton View Post
Did you dissect it outta curiosity?
I see I am not the only one that does that
__________________
Mark

My GMC build.
http://67-72chevytrucks.com/vboard/s...d.php?t=536602
mknittle is offline   Reply With Quote
Old 06-27-2013, 05:13 AM   #10
OKGMC4
Registered User
 
OKGMC4's Avatar
 
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,245
Re: Electric fan wiring issue

The two speed ford fans really need a hefty relay. They cool great but pull high amps, and that can burn up a small relay quick. If it happens again try a heavier relay.
__________________
56 GMC BUILD THREAD:
http://67-72chevytrucks.com/vboard/s...d.php?t=368649

69 long bed Chevy turned 67 gmc jimmy roadster:
https://67-72chevytrucks.com/vboard/...d.php?t=851167
OKGMC4 is offline   Reply With Quote
Old 06-27-2013, 01:47 PM   #11
Russell Ashley
Registered User
 
Russell Ashley's Avatar
 
Join Date: May 2010
Location: Lawrenceville, Ga
Posts: 2,648
Re: Electric fan wiring issue

Quote:
Originally Posted by Rufton View Post
I've experienced relay failure; the relay contact developed a white crust. Now I run redundant relays, redundant switches and redundant fuses. Occasionally, I verify both high current circuits are functioning; which reminds me I need to check em.

You probably know a relay can allow a low current circuit to trigger a separate high current fan circuit. I do have fan rated fuses in the high current circuits.
Rufton, are you powering your fan with two circuits simultaneously or is one a backup that is not used until you switch it on?
Russell Ashley is offline   Reply With Quote
Old 06-27-2013, 05:02 PM   #12
Rufton
Registered User
 
Join Date: Apr 2013
Location: Knoxville TN
Posts: 1,170
Re: Electric fan wiring issue

Two completely independent circuits. Relays can run simultaneously or independently. Both circuits are automatic and live. One of those overkill kinda things.
Rufton is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 10:29 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com