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GT40 Starter Relay Wiring |
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NZRoss 
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Joined: April-16-2025 Location: New Zealand Status: Offline Points: 4 |
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 Topic: GT40 Starter Relay WiringPosted: June-05-2025 at 1:46am |
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Hi all,
I could do with some help with the starter relay wiring on 2001 GT40 Can anyone tell me where the brown wire on this wiringing diagram goes to? Previous boat owner has fitted a key start switch (keypad is faulty) I have 12v at terminal (I) but without a ground wire, the relay doesn't operate. The purple/red wire goes to the 12pin console connector, so I don't think I can just ground the brown without adding a resistor I have checked all wiring diagrams that I can find, but I can't locate the other end of this wire Cheers, Ross |
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NZRoss
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Posted: June-05-2025 at 1:53am |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11443 |
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Posted: June-05-2025 at 8:51am |
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Your relay's ground path is the metal plate on the back that's bolted to the engine. It doesn't need a ground wire like some do.
So.....i wouldn't go grounding that brown wire When you turn the key to the Start position, do you get 12 ish volts to the "S" terminal on the relay? That's what energizes the relay to put power to the starter. If you don't get 12 volts at the "S" terminal, I'd check your shifter in the Neutral position and check that you're getting 12 volts going into the Neutral Safety Switch on the transmission when you turn the key, The flow path is from the key switch, thru the wiring harness and connector plugs back to the Neutral Safety Switch and on to the "S" terminal on the relay If the switch is sensing that the transmission is in neutral, it's closed and power passes thru to the "S" terminal on the relay If you do get 12 volts at the "S" terminal, and have no relay actuation, then you have a bad ground or the relay is bad I'd worry about that stuff before wondering where the brown wire goes to and don't even think about grounding that brown wire .  That's not the world's best diagram of the wires on a gt40 relay either even if someone at CC drew the diagram. There's one fairly important wire missing. That would be the big Red power wire to the starter The Brown wire is called Purple in other diagrams for that solenoid. It's a bit of a funny shade of some color |
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KENO
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Joined: June-06-2004 Location: United States Status: Offline Points: 11443 |
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Posted: June-05-2025 at 1:08pm |
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Here are a couple of diagrams of the gt40 relay wiring, the first one out of a PCM manual and the second one is we'll call it my "non artists rendition"
The first one is the only piece of PCM published info that I've come across that shows all 8 wires. Anything else shows some but not all
  And here's a link to the manual that the PCM drawing came from See page MT16 |
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NZRoss
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Posted: June-06-2025 at 12:53am |
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Thanks Keno
The relay I have is not original. It has been changed at some time to a generic universal one that requires a ground wire, so I will change it. Thanks for your help |
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