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TR6 Fuse box wiring mystery


Freshman Member
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Folks I bought a TR6. Apparently the previous owner had a short so unplugged the wires on the 3rd fuse. Looks like the back fast-on pair or wires. See pic. I ohmed out rhe pair to the battery so either there shorted or a switch is stuck on. Does anyone know what those pair of wore go to. My shop manual is not real clear. I see only two wires on the schematic


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Staff member
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moved to the Triumph Forum


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Much better schematic here than in the shop manual...and since there are differences it would be a good idea to state the year of your car.


Freshman Member
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75 tr6. Yes they are light purple… the body, floor pan etc are in great shape… needed a tune up and is leaking oil…. Not worried about that because the body is such good shape. the radio has no power maybe thats a clue


Obi Wan
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Do download the wiring diagram from Advanced. It's the best available. Trying to follow the one in the manual is an exercise in frustration.

The purple circuit, you will see, powers a number of functions; the problem could be anywhere among them. It's also possible that the PO disconnected the part that powers the seat belt warning system, simply because it's annoying. It might be worth the investment of a fuse to hook it up again and see what happens. If no fuse blows, you're home free.

Assuming that the fuse blows: If I were doing this, I'd disconnect the two wires, then reconnect one wire at a time to see which circuit is blowing the fuse. Then, follow the wire enough to determine what it powers, and disconnect the various parts of that circuit and see what makes the short go away. At that point, you've located the problem, and you can just look at the offending component carefully to see exactly what the problem is. Likely to be something that just didn't have enough clearance between a terminal or wire and ground, and it's making light contact.

This is basic electrical troubleshooting. Just an application of logic.


Jedi Knight
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Simple check add a light bulb in line from wire to fuse if it is shorted the light will light. If the light does not light line to that system is good. This saves fuse or shorted wire say under dash.


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Freshman Member
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Yeah i need to chase the circuit. The schematic from advanced wire really will help. I am going to pick up some spare fuses. Will let you know how i make out.


Freshman Member
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Finally got some spare fuses today… found the reason the wires were unplugged. It was in fact a faulty seatbelt switch or short. The buzzer keeps going in and off randomly. Should be an easy fix. Thanks for all the help! Now if it would just stop raining in New England i can go for a ride.
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