• Hi Guest! Being a Paying Supporter is NOT a requirement to participate at BCF. However, subscribing will help ensure we can continue to serve the LBC community for years to come. If you enjoy BCF and find our forum a useful resource...Please consider supporting us by **Upgrading**
    (PS: Subscribers don't see this banner)
Tips
Tips

TR6 Wiring problem

ceedub

Senior Member
Offline
As part of our TR6 resto we were working to complete the wiring harness install. As soon as we touched the cable to the negative terminal we experienced a spark which suggested that somewhere we have a short circuit. So we methodically began to unplug to isolate the issue. We found that the brown wire connected the starter relay at C2 to the fuse box was the culprit. There was no spark at the negative terminal with that wire disconnected. My question is, what is disconnecting that wire telling me about where this short may be occurring. We can read the wiring diagram with an amateur's eye but need some direction where we might look to solve our issue. Thanks in advance for your input.
 

TR3driver

Great Pumpkin - R.I.P
Offline
It would help to know what year TR6; you might want to add that info to your signature. I'm assuming this is a 74 or 75.

My guess is that you have the wrong starter relay, or else it is defective. Disconnect all of the wires from it, then use an ohmmeter or continuity tester (aka powered test light) to look for continuity between C2 and any other terminal. There should be no continuity without power applied across W1 and W2.

PS, if I'm correct, C2 is being connected to C4 without power to the relay coil, meaning the ignition coil is getting power through the WY wire. That is probably the source of the spark you see, rather than a direct short to ground.
 
OP
C

ceedub

Senior Member
Offline
Well, we finally got around to testing the relay and found no problems there. But, we traced the brown wire back to the fuse box and then focused our attention on the purple wire circuit on the other side and 'bingo', a dead short in the loom of a brand new wiring harness. There are two purple wires connected together at that terminal so we broke them apart and found that the smaller wire that served the seat belt warning system and warning light was the culprit. Our next project is to see if the warning light socket is faulty or the main plug to the seat belts is haywire. We were not happy that a new part is faulty right out of the box but if we can't find the short at the plug or socket we may forgo that part of the circuit. You were correct with your guess that it is a '74 TR6.
 

TR3driver

Great Pumpkin - R.I.P
Offline
Defective new parts is unfortunately a very common theme these days.
 
Similar threads
Thread starter Title Forum Replies Date
P TR6 Wiring problem Triumph 50
Joe Reed MGB Wiring problem....this should be fun :[ MG 4
Tinkerman TR2/3/3A TR3A Horn Wiring Problem Triumph 2
jaegzie Ignition/Wiring problem. Spridgets 11
R Under dash wiring problem-BJ7 Austin Healey 10
R BJ-7 Fuse block wiring problem Austin Healey 18
R BJ-7 overdrive relay wiring problem Austin Healey 1
Shealey Getting close with the wiring Just one problem Spridgets 4
Jayrz Wiring problem Spridgets 5
VelodromeRacer Possible wiring problem? Austin Healey 3
R Solenoid Wiring Problem Austin Healey 12
M Spitfire Spitfire[Lucas]wiring problem FOUND! Triumph 12
J another lucas wiring problem Triumph 7
D TR6 Wiring problem - re headlights/starter motor 74TR6 Triumph 6
bluemiata90 TR4/4A Wiring problem with TR4 Triumph 8
Obtong Horn Wiring Problem MG 9
B TR4/4A Wiring Harness Triumph 4
R Wiring ??'s Spridgets 15
Healey Nut Rear Wiring Routing Austin Healey 2
7 General TR Wiring harnesses Triumph 5
Got_All_4 TR5/TR250 Wiring/Electrical Mystery Worked Perfect Then Not Triumph 5
MGTF1250Dave T-Series TF Windscreen Wiper wiring MG 4
M TR6 Fuse box wiring mystery Triumph 9
Healey Nut Wiring Harness Routing Austin Healey 5
J Wiring Harness Austin Healey 5
nichola TR6 Question on new wiring harness Triumph 6
R TR2/3/3A 1954 TR-2 O.D. Wiring Triumph 9
TomMull Dash wiring Plus 2 S Lotus 16
MadRiver BT7 Wiring Diagram Austin Healey 4
R TR2/3/3A Replace wiring harness in steering column Triumph 61
B Bugeye Electrical Wiring Diagram in Logic Format Spridgets 13
J TR6 73 TR6 Temp Gauge Wiring Question Triumph 6
Sopwith_Camel MGB wiring new Tacho MG 0
Ripper01 For Sale- TR6 Wiring Harness Triumph Classifieds 0
R TR2/3/3A Install new wiring harness in steering column Triumph 16
R TR2/3/3A Steering Column Wiring Triumph 18
Got_All_4 TR5/TR250 Pros and Cons to Wiring The Radio Direct Triumph 6
R TR2/3/3A Wiring from the steering column Triumph 7
D TR2/3/3A Tr3 horn testing and wiring Triumph 8
B Bugeye Sprite Wiring Diagram Spridgets 1
JPSmit Todays question - wiring Spridgets 14
ckeithjordan TR2/3/3A Overdrive Wiring Triumph 5
M General MG OEM Radio wiring help MG 4
R TR2/3/3A Overdrive wiring installation Triumph 14
ckeithjordan TR2/3/3A Wiring Harness Question[s] Triumph 10
nichola TR6 Victoria British wiring harness for TR6 Triumph 6
C For Sale MGA wiring harness MG Classifieds 3
C MGA Wiring harness question MG 6
JPSmit I'm stumped - wiring Spridgets 2
R TR2/3/3A Wiring 1954 TR-2 Triumph 12

Similar threads

Top