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Old 07-24-2007, 08:38 PM
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Ford relay ratings?

Anyone know the Amp rating on Ford fuel pump relays? How about the other similar relays such as the EEC power relay or the WOT cutout relay?

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Old 07-24-2007, 10:52 PM
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Doc here,

That's something you will have to look up Vehicle specific, displacement specific, and application Specific....

Not all "Ford" relays are the same..they vary from application to application..

Most automotive relays range from 30 amp on up to heavy current handling relays..in increments of 10 amps..If you had to guestimate..go with a 40..unlike fuses, too big is better..

The other way to tell, is pull the relay, look on the bottom or side of the relay for a data plate that looks like this:
  • Coil: 12 VDC

  • Coil Draw: 1 amp.

  • Contact rating: 250 VAC/DC (Arc over or weld point)

  • Contact Current Max: 30 amp. (melt down point)


Or it may have one of hose Day~um cryptic Ford numbers like : CAE~0006724~8946234~268947`30 , That you need an Enigma Machine , Code breakers at Heathrow, and the French underground sending coded messages to "Kinch" at stalag 13 , to relay to Hogan to Decipher ...to cross it over to an item we humans can deal with..

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Old 07-25-2007, 12:06 PM
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Yep, it's in code alright I will take the number to the dealer but those guys at the local Ford shop are not much help.

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Old 07-25-2007, 02:57 PM
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Doc here,

You may want to Try this:

Get a Bosch relay, 40 amp...(Kragens has them for like $3.99 just bring yours in for matching)..

and compare the footprint against the footprint of the relay that came out..

If they match, go ahead and try it..It should work, as the Items you listed SHOULD not draw more than 40 amp..AND going larger on a relay won't compromise anything..

If the footprint doesn't match, try a bosch in Single pole, single throw,..Double throw, Double row, etc..(different contact arrangements and pin counts) until you find a match.

Standard Pin arrangements for a Bosch relay are:
  • Pin#85 = Coil + or - 12VDC, about 1 amp.

  • Pin#86 = Coil + or - 12VDC, about 1 amp.

  • Pin#30 = Center wiper CONTACT SET.

  • Pin#87 = Normally Open CONTACT SET.

  • Pin#87a = Normally Closed CONTACT SET.




You can OHM this out (while powering the coil) to verify this arrangement.



That should help.

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Old 07-26-2007, 12:14 AM
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Quote:
Originally Posted by oldred

Anyone know the Amp rating on Ford fuel pump relays? How about the other similar relays such as the EEC power relay or the WOT cutout relay?
What are the I.D. markings? Application?
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Old 07-26-2007, 01:32 PM
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1987 Mustang LX 5.0

One is a fuel pump relay-E3TB-9345-A2A

The other is a EEC power relay-E3AF-12A646-B2A

Another nearly identical EEC power relay I have has almost the same number and fits the socket-E3(A?)12A646-B1A/7ED

Unknown application Ford relay-E4LB-13A025-A2A

I am assuming that is one part number for each but it is arranged in three numbers (hence the dashes) vertically on the case, for space reasons I assume.

Last edited by oldred; 07-26-2007 at 02:01 PM.
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Old 07-27-2007, 10:45 AM
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Quote:
Originally Posted by oldred

1987 Mustang LX 5.0

One is a fuel pump relay-E3TB-9345-A2A

The other is a EEC power relay-E3AF-12A646-B2A

Another nearly identical EEC power relay I have has almost the same number and fits the socket-E3(A?)12A646-B1A/7ED

Unknown application Ford relay-E4LB-13A025-A2A

I am assuming that is one part number for each but it is arranged in three numbers (hence the dashes) vertically on the case, for space reasons I assume.
Red,

Sorry it took so long...Milk of Magnesia took a while to cut in this morning...

The FORD MPC has a master Relay I.D. Changeover but does not give the AMP ratings. If the relay is not actually marked regarding it's rating, you will have to go to a wiring diagram. Thought I could cheat but no.

The E4LB 13A024-A2A is a LINC headlamp dimmer relay.
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Old 07-27-2007, 09:07 PM
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Ok I checked my wiring diagram but no luck there either and the dealer was no help at all, I guess I am out of luck on this one but thanks a lot for looking up those numbers I do appreciate it.
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Old 07-28-2007, 08:14 AM
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Any suggestions for a relay to switch power to an auxiliary fuse panel that will have a max of about 40+ amps? All of the relays I can find are rated at 30 amps or less for a continuous rating.
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Old 07-28-2007, 12:04 PM
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Try here Red- http://www.waytekwire.com/automotive-relays.htm
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Old 07-28-2007, 04:41 PM
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Doc here,

To find out what is required as to draw on any certain relay, go to the Device it supports ... read the data plate and see what the draw is..THEN note the gauge wire, compare that and the length of the run against a National AWG chart..

Do not use a relay LOWER in value than the device or wire gauge..

The SAME info may be present at the fuse panel, at the device fuse..

I'm betting for what you are needing, any 30 amp relays with a matching footprint will work just fine..

Only when you get up into cooling fans and the like do your relays go high current due to startup and spike conditions as well as wind resistance and rotor lock.

Headlight circuits use higher current relays as well.


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Old 07-28-2007, 06:26 PM
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Thanks guys, I may have found what I am looking for (a Bosch relay rated at 40 amps N.O.) One thing for sure I have learned quite a bit about relays while searching for this.
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Old 07-29-2007, 04:33 PM
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This place sells relays that are rated for continuous duty up to 70-80 amps.

http://www.fourthgen.net/relayscart70A5P.html

Bruce
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Old 07-29-2007, 06:20 PM
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I went to NapaOnLine.com and entered those Ford engineering numbers into the [Non-Napa Part Number] field and pressed [Go] ...
These are the results.



# E3TB 9345 A2A -- Fuel Pump Relay
Napa Echlin Part Number: AR-240

Attributes:
Features & Benefits:N.O. Terminals 3-4 @ 35 Amps; N.C. Terminals 3-5 @ 20 Amps; Coil Terminals 1-2
# of Terminals:5

----------------------------------



# E3AF-12A646-B2A -- EEC Power Relay
NAPA Echlin Part Number: AR-242

Attributes:
Features & Benefits:N.O. Terminals 3-4 @ 25 Amps; N.C. Terminals 3-5 @ 15 Amps; Coil Terminals 1-2
# of Terminals:5

----------------------------------

Just for fun ... I also went to www.Motorcraft.com (Ford's own) and tried to c/ref them there ... and no go!

I used to sell a ton of both of these relays, and used to know the Motorcraft numbers off the top of my head ... but that's gone now.

These relays are used for a multitude of different applications and functions.
For example, 87-91 F-Series pickups used one of each side-by-side under the hood for fuel pump/EEC purposes as well.

Edit / Add-on:
Regarding the suffix on those Ford engineering numbers (-A1A, -A2A ... etc)
The DIGIT (1,2) an usually be ignored. It usually indicates a minor revision or a supplier change. In other words ... E3TB-9345-AA is the same as "E3TB-9345-A1A and A2A".

Last edited by 66GMC; 07-29-2007 at 06:33 PM.
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Old 07-30-2007, 07:34 AM
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Thanks, I have added all this to my reference book I had noticed that suffix difference on two apparently otherwise identical fuel pump relays and I was curious about what could be different. What brought all this up is that I switched to a Bosch external fuel pump from the Mustang in-tank pump I had been using. I have not yet checked the current draw on this new pump but the thing is huge compared to the Ford in-tank pump and I was afraid the stock relay would not be heavy enough. The question about a relay for an auxiliary fuse panel is for another project and the fuel pump was my big concern here. I was told by someone local that the EEC power relay was rated higher than the fuel pump relay but I was a bit skeptical that was the case and apparently it is the other way around.
Thanks again everyone.
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