 NPC fuel relay test |
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| r_towle |
 Jul 5 2017, 04:05 PM
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#1
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Custom Member  Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States 
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How would you test two things here.
One The relay is below. Basically Two large spades, assume power at one, none at the other till relay is thrown. Two small ones, one is really small, one is normal size. I would like to bench test the relay, using the correct ground and positive lead. Second, On the fuse panel socket for the relay. I am assuming I should see live power at one of the large poles when the key is off or on.... The other would be fed by the relay when triggered. I assume one of the smaller leads would be 12vdc when the key is on, the other should be ground. I had to take a 18 year old alarm system out because it killed the car on the side of the road, and this fuel circuit is giving me a ru for my money. Need some help to check I am doing this right.. Rich Attached image(s) 
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| 76-914 |
Jul 5 2017, 04:20 PM
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#2
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,742 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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Test it with a flashlight battery. 1.5v won't hurt anything. Most likely the small spade is the ground to the coil. The one catty corner to it is probably the + switched connection. If so you'll hear it click. Verify continuity on the remaining 2 poles when voltage is applied to the switched side.
As far as the supply side being always hot. I don't see why it couldn't be fed by a switched source as long as it were large enough to handle the load. (IMG:style_emoticons/default/beerchug.gif) |
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| r_towle |
Jul 5 2017, 05:37 PM
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#3
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Custom Member Group: Members Posts: 24,705 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States
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ok,
I got a new fuel pump relay. Fuse blew. I am going to test the pump first with 12 volts to see if that works... then find the short. It seems that the short would be between power and the fuse, not on the other side of the relay... I think its power----fuse----relay----pump But the drawing I am finding are not worth looking at. Rich |
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| 76-914 |
Jul 6 2017, 07:55 AM
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#4
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Repeat Offender & Resident Subaru Antagonist Group: Members Posts: 13,742 Joined: 23-January 09 From: Temecula, CA Member No.: 9,964 Region Association: Southern California
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Rich, post a pic of the schematic. I don't see why it couldn't be, power-relay-fuse pump, as well. I believe either would work although the relay would be unprotected but that shouldn't be a problem. (IMG:style_emoticons/default/beerchug.gif)
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