Working with Relays, A little help understanding... |
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Working with Relays, A little help understanding... |
malaga_red75 |
Jul 15 2009, 04:19 PM
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#1
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'74 2.5L N/A Subie Group: Members Posts: 454 Joined: 5-March 06 From: Menlo Park, CA Member No.: 5,674 Region Association: None |
So I am using aftermarket relays for the fuel pump and the cooling fans on my subaru conversion, using the stock ECU. I have attached a picture of the relay diagram.
So, there are two circuits, an 'inner' circuit and an 'outer' circuit. The outer circuit is only completed when the inner circuit's electromagnet is active. It is currently wired like this: The 'inner circuit' receives a signal from the fuel pump pin on the ECU which goes into terminal 86 on the relay. (and here is where i think it has been wired wrong), coming out of terminal 85 the wire goes into the ECU into a 12 volt power connection. This is for the 'inner' circuit which should ignite the electromagnet. --- I THINK THIS IS WRONG. ---Shouldn't the wire coming out of terminal 85 go to a ground? thus completing the inner circuit and cause the magnet to attract the arm to complete the 'outer' circuit. I hope that wasn't too confusing, let me know. Thanks a bunch! -Peter |
busmech |
Jul 15 2009, 09:49 PM
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#2
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Member Group: Members Posts: 68 Joined: 12-April 09 From: Daly City Ca Member No.: 10,258 Region Association: Northern California |
85 and 86 does not matter which one is pos. and which is neg.
Most ecu circuits are outputing a ground to activate a relay, but some are bat. voltage. You need to find out what you have, conect it to 85 or 86 does not matter, and then the other one goes to a ground or batttery. you should have 30 wired to battery, fuse protected of course, then 87 goes to the fuse pump |
mskala |
Jul 15 2009, 10:44 PM
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#3
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R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
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