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Re: This look right? (relay question)
[Re: Mr.Yuck]
#953965
03/19/11 11:10 PM
03/19/11 11:10 PM
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Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
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You're running switched 12V (ign1) to the pump but it goes thru a relay right b 4 the pump. What is the relay connecting???
live every 24 hour block of time like it's your last day on earth
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Re: This look right? (relay question)
[Re: RapidRobert]
#953966
03/19/11 11:13 PM
03/19/11 11:13 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
OP
Not enough dumb comments...yet
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OP
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
You're running switched 12V (ign1) to the pump but it goes thru a relay right b 4 the pump. What is the relay connecting???
the pump? Does the relay need to go b4 the swtich?
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Re: This look right? (relay question)
[Re: Mopar_Country]
#953968
03/19/11 11:36 PM
03/19/11 11:36 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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A relay is used so the switched power is a very minimal load (the relay draw-in coil) but a second power lead typically straight from the battery or the starter relay so it's a high amp full voltage direct source actually provides the power to run the main load (fuel pump).. Your circuit does have a main power lead...
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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Re: This look right? (relay question)
[Re: Jim_Lusk]
#953970
03/20/11 04:27 AM
03/20/11 04:27 AM
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Joined: Jan 2003
Posts: 70,126
Here
DirectSubjection
Tacohead. The First and Only
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Tacohead. The First and Only
Joined: Jan 2003
Posts: 70,126
Here
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As mentioned above - relays should have 4 connections - ground, major positive power from a direct battery source, minor positive activation power from a switched source (to turn it on), and a major power out feed to the related device.
Ride eternal, shiny and chrome
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Re: This look right? (relay question)
[Re: 1_WILD_RT]
#953975
03/20/11 02:14 PM
03/20/11 02:14 PM
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Joined: Oct 2010
Posts: 606
Montana
Yancy Derringer
mopar
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mopar
Joined: Oct 2010
Posts: 606
Montana
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Quote:
Quote:
Quote:
This might help.
http://www.pacificp.com/pdf/Fuel%20Pump%20Relay%20Unit%20%28Online%29%20Diagram.pdf
thanks, that's it. I could remember. last I did one the battery was in the trunk. I'll switch it up. Hope to get it fired up today. 
the 85 post can that go to the switch or should it run to the key on then the switch?
Do you want to run the pump with the engine off? You can wire it either way but since the only reason to run it is when the engine is running it makes sense to feed it from a key on power source..
To add to the above, unless your battery is in the trunk, and that's where you pulled power, there is no good reason to mount the relay in the back. You just have to run the switch lead further.
As someone else said, I would at least run the switch lead TO IGNITION RUN so that the pump is on/ off with the key.
ALSO consider doing one of two things: either find a "crash switch" and wire into the switch lead, or buy an oil pressure switch for the purpose.
That way if you wreck the car, the pump will not be operating.
Also, DID YOU FUSE it? Find out from the pump instructions what the pump draws in amps, and use the next size larger fuse. The fuse/ breaker should be as CLOSE TO THE BATTERY as possible.
WHAT SIZE WIRE are you running to the pump? Once again, find out what the pump draws. I would not use anything smaller than #12, and depending on the pump, possibly larger.
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Re: This look right? (relay question)
[Re: Yancy Derringer]
#953976
03/20/11 03:00 PM
03/20/11 03:00 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
OP
Not enough dumb comments...yet
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OP
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
Quote:
Quote:
This might help.
http://www.pacificp.com/pdf/Fuel%20Pump%20Relay%20Unit%20%28Online%29%20Diagram.pdf
thanks, that's it. I could remember. last I did one the battery was in the trunk. I'll switch it up. Hope to get it fired up today.
the 85 post can that go to the switch or should it run to the key on then the switch?
Do you want to run the pump with the engine off? You can wire it either way but since the only reason to run it is when the engine is running it makes sense to feed it from a key on power source..
To add to the above, unless your battery is in the trunk, and that's where you pulled power, there is no good reason to mount the relay in the back. You just have to run the switch lead further.
As someone else said, I would at least run the switch lead TO IGNITION RUN so that the pump is on/ off with the key.
ALSO consider doing one of two things: either find a "crash switch" and wire into the switch lead, or buy an oil pressure switch for the purpose.
That way if you wreck the car, the pump will not be operating.
Also, DID YOU FUSE it? Find out from the pump instructions what the pump draws in amps, and use the next size larger fuse. The fuse/ breaker should be as CLOSE TO THE BATTERY as possible.
WHAT SIZE WIRE are you running to the pump? Once again, find out what the pump draws. I would not use anything smaller than #12, and depending on the pump, possibly larger.
have #12 was going to run it from the "run" so it's only on when key is on, I also have a switch so the key has to be on and the switch up. Holley blue pump. I have 15amp fuse now but can swap it w/o issue. Should I run both main feed and switch from "run" or only switch and main from 12v side of the starter relay?
didn't really see the need to go all the way to the battery.
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Re: This look right? (relay question)
[Re: Mr.Yuck]
#953977
03/20/11 03:20 PM
03/20/11 03:20 PM
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Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
1_WILD_RT
Management Trainee
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Management Trainee
Joined: Jan 2004
Posts: 27,347
Today? Who Knows?
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The whole purpose of a relay is to supply full clean power to the load... The main feed should go to either the battery, the battery post on the starter relay or the battery post on the starter.... You don't want the actually supply lead switched but you do want it fused close to where it gets power....
"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."
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Re: This look right? (relay question)
[Re: Mr.Yuck]
#953979
03/20/11 04:16 PM
03/20/11 04:16 PM
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Joined: Oct 2010
Posts: 606
Montana
Yancy Derringer
mopar
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mopar
Joined: Oct 2010
Posts: 606
Montana
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Quote:
Quote:
Quote:
Quote:
Quote:
This might help.
http://www.pacificp.com/pdf/Fuel%20Pump%20Relay%20Unit%20%28Online%29%20Diagram.pdf
thanks, that's it. I could remember. last I did one the battery was in the trunk. I'll switch it up. Hope to get it fired up today.
the 85 post can that go to the switch or should it run to the key on then the switch?
Do you want to run the pump with the engine off? You can wire it either way but since the only reason to run it is when the engine is running it makes sense to feed it from a key on power source..
To add to the above, unless your battery is in the trunk, and that's where you pulled power, there is no good reason to mount the relay in the back. You just have to run the switch lead further.
As someone else said, I would at least run the switch lead TO IGNITION RUN so that the pump is on/ off with the key.
ALSO consider doing one of two things: either find a "crash switch" and wire into the switch lead, or buy an oil pressure switch for the purpose.
That way if you wreck the car, the pump will not be operating.
Also, DID YOU FUSE it? Find out from the pump instructions what the pump draws in amps, and use the next size larger fuse. The fuse/ breaker should be as CLOSE TO THE BATTERY as possible.
WHAT SIZE WIRE are you running to the pump? Once again, find out what the pump draws. I would not use anything smaller than #12, and depending on the pump, possibly larger.
have #12 was going to run it from the "run" so it's only on when key is on, I also have a switch so the key has to be on and the switch up. Holley blue pump. I have 15amp fuse now but can swap it w/o issue. Should I run both main feed and switch from "run" or only switch and main from 12v side of the starter relay?
didn't really see the need to go all the way to the battery.
I looked up the Holley blue and it claims to only draw 3A and 7 1/2 A fuse is what they recommend. Frankly, I was surprised it was so low.
No 12 main feed should be fine in that case Starter relay should be OK, just put a fuse as close to that as you can.
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Re: This look right? (relay question)
[Re: Mr.Yuck]
#953982
03/20/11 06:13 PM
03/20/11 06:13 PM
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Joined: Oct 2010
Posts: 606
Montana
Yancy Derringer
mopar
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mopar
Joined: Oct 2010
Posts: 606
Montana
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Quote:
Ok so it works whe i have the switch and main into the hot side of the relay. However when i hook the switch into the brown relay it's a no-go. I thought that wire was "hot" when the key was on? Do I have to run the switch lead into the fuse box?
Now I'm confused. You need to post what sort of relay you are using so we can help get the contact layout figured.
The relay should have at least two contacts.
The pump hooks to one contact
The big hot feed goes to the other
The relay should have two coil terminals
One gets grounded
The other goes to your small wire going to the switched power
To check your relay, unhook the pump lead and turn the key / switch on/ off. You should hear the relay click, might need a friend.
Or turn on key, pull switched lead off relay, it should drop out, hook it up, click in. Turn off key/ switch, recheck. Relay, of course should NOT click.
If you go to the Holley site, there is a LOT of info there:
http://www.holley.com/12-802-1.asp
READ THIS:
http://www.holley.com/data/Products/Technical/199R7914-3rev2.pdf
and some more good general info
http://www.holley.com/data/Products/Technical/Fuel%20Pump%20Tech%20Info.pdf
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Re: This look right? (relay question)
[Re: Yancy Derringer]
#953983
03/21/11 08:11 AM
03/21/11 08:11 AM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
OP
Not enough dumb comments...yet
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OP
Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
|
Quote:
Quote:
Ok so it works whe i have the switch and main into the hot side of the relay. However when i hook the switch into the brown relay it's a no-go. I thought that wire was "hot" when the key was on? Do I have to run the switch lead into the fuse box?
Now I'm confused. You need to post what sort of relay you are using so we can help get the contact layout figured.
The relay should have at least two contacts.
The pump hooks to one contact
The big hot feed goes to the other
The relay should have two coil terminals
One gets grounded
The other goes to your small wire going to the switched power
To check your relay, unhook the pump lead and turn the key / switch on/ off. You should hear the relay click, might need a friend.
Or turn on key, pull switched lead off relay, it should drop out, hook it up, click in. Turn off key/ switch, recheck. Relay, of course should NOT click.
If you go to the Holley site, there is a LOT of info there:
http://www.holley.com/12-802-1.asp
READ THIS:
http://www.holley.com/data/Products/Technical/199R7914-3rev2.pdf
and some more good general info
http://www.holley.com/data/Products/Technical/Fuel%20Pump%20Tech%20Info.pdf
standard 4 prong... I think the posts are 85, 86, 87 and 30. Have it all wired correctly as per insructions on package.
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