ChrisJ15
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| posted on 24/5/14 at 05:20 PM |
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Which Relay to Use for Ford Duratec
I'm creating my own wiring loom from scratch in a Sylva J15 using a Ford Duratec from an ST150.
I guessing that the relay for the starter motor should be a heavy duty item but I can find a part number or what rating to use.
I have three relays that were on the engine loom that came with the car and one has a couple of connectors that are much larger plus the wires coming
from it are bigger. I suspect that was the starter relay but I cant find the part number anywhere.
Can anyone advise what is a good rating for a starter for this size engine?
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big_wasa
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| posted on 24/5/14 at 05:43 PM |
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The relay for the starter is called the solenoid and its part of the starter.
The solenoid draws around 10A so depending on what switch you are using you may or may not need one.
There would be a relay in the focus for two reasons. The first. switch gear and loom is designed for low currents and second the ecu uses the relay to
immobilize the starter.
A standard 40A relay is fine.
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ChrisJ15
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| posted on 25/5/14 at 08:23 AM |
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Thanks, I knew there was a solenoid in the starter but wasn't sure if I needed a relay to power that.
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big_wasa
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| posted on 25/5/14 at 09:14 AM |
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Depends on how your switching it ?
Sierra ignition switch ? No
25A momentary push switch ? No
Savage start button ? No they have a relay mounted to them.
Ford Puma / Fiesta column ignition switch ? Yes I would use a relay. 
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ChrisJ15
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| posted on 25/5/14 at 11:36 AM |
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That's interesting because I was going to start (no pun intended!) with the ignition switch and then change to a press button at a later stage.
Might go straight for the button and save a relay!
Thanks for your help.
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peter030371
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| posted on 25/5/14 at 01:36 PM |
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quote:
Originally posted by big_wasa
Savage start button ? No they have a relay mounted to them.
I am not sure that is correct, mine has a microswitch on the back rated at 6amp not a relay.
I would use something like this
http://www.ebay.co.uk/itm/12V-RELAY-4-PIN-AUTOMOTIVE-30AMP-RY1-CHANGEOVER-12-volt-Car-Van-Boat-Spotlight-/291093491
463?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item43c6862f07
cheap as chips, easy to use and no risk of melting the switch contacts 
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big_wasa
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| posted on 25/5/14 at 04:48 PM |
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I guess that depends on the switch this one says START SAVAGE REPLACMENT PUSH BUTTON SWITCH that would be fine.
Use a relay and can start it from the key or a button depending on the mood.
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