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Wiring a relay with internal diode

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Guido401 
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Member spacespace
Joined: June 09, 2003
Location: United States
Posted: June 09, 2003 at 3:45 PM / IP Logged  
I've read several posts but still don't quite understand. The relay I have is to be used to control my electric fan. It is a NAPA Echlin model AR274. Can someone please explain in SIMPLE terms how to wire this. I will have a toggle switch located under the dash for on/off. The relay shows the diode between  -85 and +86. Can you tell me what wire goes to -85, which to +86, what wire to 87, 87 and 30. Please keep it simple. I already have a headache. THANKS.
Velocity Motors 
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Joined: March 08, 2002
Location: Manitoba, Canada
Posted: June 09, 2003 at 3:58 PM / IP Logged  

Is the fan a (-) trigger on or a (+) trigger on  through the toggle switch ?

Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Guido401 
Member - Posts: 4
Member spacespace
Joined: June 09, 2003
Location: United States
Posted: June 09, 2003 at 4:21 PM / IP Logged  
Jeff I don't know what you mean by that. I haven't installed the switch yet. Please excuse my ignorance. Can you give me a step by step way to wire this? Thanks.
Velocity Motors 
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Posted: June 09, 2003 at 4:39 PM / IP Logged  

Depending on the wire that will turn on the fan motor for you ( read the instructions ) to see if the fan will turn on by a negative trigger or if it requires a (+) trigger to turn on. Depending on the type of trigger you will use either a (+) or a (-) relay system.

Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Guido401 
Member - Posts: 4
Member spacespace
Joined: June 09, 2003
Location: United States
Posted: June 09, 2003 at 6:31 PM / IP Logged  
OK the fan instructions said to reverse the polarity for the puller fan I am using. So the motor will have the POSITIVE wire to ground and NEGATIVE to the fuse block. So I guess it would be called  (-) trigger. This wire would go from the fuse block to the switch. Then from the other switch terminal to the -85 terminal on the relay??? Would the wiring then continue from #+86 to the fan motor? Then what wires to the 2 #87 terminals and to the #30 terminal
Velocity Motors 
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Moderator 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 Fabrication. 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 08, 2002
Location: Manitoba, Canada
Posted: June 11, 2003 at 11:05 AM / IP Logged  
IF the system is a (-) trigger you need to wire up the relay like this: Negative to Negative Relay Diagram this willl send a low level (-) signal from the toggle switch to the relay & the relay will convert the low level to a high level (-) signal.
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Guido401 
Member - Posts: 4
Member spacespace
Joined: June 09, 2003
Location: United States
Posted: June 11, 2003 at 11:12 AM / IP Logged  
Thanks for the input. I got it wired and it's working great.
Velocity Motors 
Moderator - Posts: 12,488
Moderator 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 Fabrication. 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 08, 2002
Location: Manitoba, Canada
Posted: June 11, 2003 at 11:23 AM / IP Logged  
Awesome. Glad I could help.
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

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