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Sold
by simon8201 - 09/09/26 01:46 PM
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Wales
by Joske Vermeule, September 1
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Forums39
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Jun 14th, 2026
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Joined: Jun 2014
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L - Learner Plates On
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OP
L - Learner Plates On
Joined: Jun 2014
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My roadster 2004 won't start. what was an occasional issue is now a problem as the dash ignition lights do not come on.
On examining the relays behind the dash there appears to be 5 in a group and a sixth that just sits in the wiring loom that i take to be the wipers.
My questions are :- what are the five in a line doing? ( I THINK THERE WAS A PREVIOUS THREAD ON THIS TOPIC)there is some corrosion on the lugs of one of them.
where can i get replacements as i am not sure if the descriptions on the internet search match those on the relay.
I seem to have 4 identical relays with a code 3085 868787a.
The fifth one is different.
Electrics isn't my thing so any guidance would be most welcome.
Paul
2004 Silver Roadster S1
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Roadster Guru Member of the Inner Circle
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Roadster Guru Member of the Inner Circle
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DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4
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Needs to Get Out More!
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Needs to Get Out More!
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The numbers you quote Paul are the individual generic pin codes for a 5 pin relay with changeover contacts, so not defining it. Typically though they would be cube shaped 5 pin 12 volt 40 amp mini relays with diode protection (important) available on line or at all good auto electric outlets. They are sometimes supplied with a metal mounting lug which needs to be removed. The wiper relay is a dedicated item however.
Always wise to carry a couple of replacements with you which can be quickly plugged in if only for fault finding
The five similar ones in a row are starter, fuel pump, ignition/ECU, rad fan low speed, rad fan high speed as viewed right to left.
If no dash lights with ignition on I would suspect the ignition/ECU relay. If simply starter not working then the starter relay.
Richard
2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone
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The fuel pump one also fires up the ECU and the dash ignition etc.
JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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L - Learner Plates On
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many thanks gents.
It looks like its the fuel pump relay which is showing signs of corrosion.
I shall change the relays over to see if it fixes it.
Paul
2004 Silver Roadster S1
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JohnV6
2022 CX Plus Four
2025 Renault Scenic Alpine etech "Yvette"
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Learner Plates Off!
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Learner Plates Off!
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It's a good idea to buy diode protected relays, I use the Durite range for quality and reliability. Ensure that you get the correct pin orientation to suit your existing sockets, oh and correct current rating of contacts, i think i used 30amp throughout to be on the safe side.
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