need help NOW!!! - fan relay!!!
Thread Starter
Member
Joined: Dec 2000
Posts: 116
Likes: 0
From: Jacksonville, FL
need help NOW!!! - fan relay!!!
I just hooked up a manual fan switch to my cooling fan relay. Everything works as it should (fan turns on and stays running), except that the relay itself is buzzing.
The buzzing sound is new.
What is it, and what can I do?
Joe
------------------
86 IROC TPI 305
700-R4 with Trans-go shift kit
K&N Air filters
Dyno-Max cat-back
Summit tranny cooler
CEI throttle enhancer chip
[This message has been edited by JoeIROC (edited May 12, 2001).]
The buzzing sound is new.
What is it, and what can I do?
Joe
------------------
86 IROC TPI 305
700-R4 with Trans-go shift kit
K&N Air filters
Dyno-Max cat-back
Summit tranny cooler
CEI throttle enhancer chip
[This message has been edited by JoeIROC (edited May 12, 2001).]
Junior Member
Joined: Apr 2001
Posts: 17
Likes: 0
From: Indianola Iowa
when hooking up a manual fan switch you take out the need for a fan relay. power to the relay is controlled by the computer, so using a manual switch takes the place of the relay.
------------------
you can never have too much horsepower
------------------
you can never have too much horsepower
Member
Joined: Jul 2000
Posts: 461
Likes: 0
From: Warrenton, VA U.S.A.
The above post is not true UNLESS the switch is rated at over 20 amperes (30-40 would be better). Since 20-40 ampere switches are generally not used to turn the fans on/off, the relay is required to boost the switching current.
With a relay of proper size (30 amperes), you'll only need a switch rated at less than one ampere (the relay will draw ~150mA [0.15 ampere]).
The buzzing probably comes because the coil and/or switching contact(s) of the relay were probably connected incorrectly.
Without any further information to go on, all I can suggest is to check the wires connected to the relay. It sounds like you are getting "feedback" from one or more of the switching contact(s) to one or more of the coil contact(s).
FYI, this is essentially how buzzers work.
With a relay of proper size (30 amperes), you'll only need a switch rated at less than one ampere (the relay will draw ~150mA [0.15 ampere]).
The buzzing probably comes because the coil and/or switching contact(s) of the relay were probably connected incorrectly.
Without any further information to go on, all I can suggest is to check the wires connected to the relay. It sounds like you are getting "feedback" from one or more of the switching contact(s) to one or more of the coil contact(s).
FYI, this is essentially how buzzers work.
Thread Starter
Member
Joined: Dec 2000
Posts: 116
Likes: 0
From: Jacksonville, FL
Thanks for the info. The switch was hooked up incorrectly. I find it odd however:
The switch is a lighted switch with the following connections:
Ground, ACC ON, Power ON
I hooked up ACC ON to blk/red on the fan relay, and Power ON to grn/wht. Obvously, I grounded the ground.
This caused buzzing. When i removed the ACC ON line from the switch, everything worked, including the light inside the switch.
What the hell is ACC ON for?
------------------
86 IROC TPI 305
700-R4 with Trans-go shift kit
K&N Air filters
Dyno-Max cat-back
Summit tranny cooler
CEI throttle enhancer chip
The switch is a lighted switch with the following connections:
Ground, ACC ON, Power ON
I hooked up ACC ON to blk/red on the fan relay, and Power ON to grn/wht. Obvously, I grounded the ground.
This caused buzzing. When i removed the ACC ON line from the switch, everything worked, including the light inside the switch.
What the hell is ACC ON for?
------------------
86 IROC TPI 305
700-R4 with Trans-go shift kit
K&N Air filters
Dyno-Max cat-back
Summit tranny cooler
CEI throttle enhancer chip
Junior Member
Joined: Apr 2001
Posts: 17
Likes: 0
From: Indianola Iowa
when i did this to my 86 i put a fuse in line with the switch at first i used a 20amp fuse which blew now im using a 25 amp fuse with no problems. the acc on lead is used for the fan if you dont use the relay but since you used a relay the will be not used.
------------------
you can never have too much horsepower
------------------
you can never have too much horsepower
Thread
Thread Starter
Forum
Replies
Last Post