• 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

Overdrive wiring question

Coyote1

Senior Member
Offline
I am trying to hook up all the wiring on a partly restored 74 1/2 TR6 I picked up. I am confused about the wires that go to the overdrive. There are four female connectors (black and taped together) that seem like they should go to the two switches on top. However, the lead to the solenoid has four female connectors (white) in series on that single wire.
Can anyone explain where these go, is something there that shouldn't be, or am I just screwed up? The book doesn't give me a clear layout of these wires.
 

TR3driver

Great Pumpkin - R.I.P
Offline
Is this a J-type OD, or A-type?

Normally a J-type would have only one switch on the top cover for the OD; but there could be other switches for the backup lights and starter interlock. The solenoid would have just a simple wire from one terminal of the switch on the top cover, and another wire from the other terminal to ground.

I'm afraid I don't understand your comment about four female connectors in series.

The wiring diagrams at https://www.advanceautowire.com/schematics.htm are generally considered to be the best. The books frequently don't cover all the variations (especially in US-spec cars).
 
OP
Coyote1

Coyote1

Senior Member
Offline
First, it is a "J".
I was looking at it again and am thinking that the black connectors may not even go to the trans. The connectors on the single wire to the solenoid may be for the trans. switches. They were all together with a wire tie.

If that is correct, then I need to find a home for the black connectors.

Still confused!
 

rlich8

Jedi Trainee
Offline
hondo402000 said:
yours is a lot more complicated than my 71 model, you should get a wiring diagram for your year

Hondo

Yea, I second that.

The TR4's, TR4A's, TR250's and early TR6's are easy. The late ones get tough.
 

tdskip

Yoda
Country flag
Offline
+1 on Advance diagrams.

The wiring isn't that hard. Sometimes it is helpful to pull everything off and put it all back together correctly.
 
OP
Coyote1

Coyote1

Senior Member
Offline
I checked the wiring diagram and the OD is the Yellow/Green wire I'm looking at. The two switches on top of the shifter activate second gear OD and third/fourth OD. The single wire in a series configuration would allow the solenoid to activate from either switch. Checked the switches and found they are both bad but was able to feel movement of the selector rods through the holes.
 

TR3driver

Great Pumpkin - R.I.P
Offline
The J-type should only be active in 3rd & 4th gear, so it takes only one switch on top of the shifter. You must be looking at a wiring diagram for an earlier car.
 

Attachments

  • 25853.jpg
    25853.jpg
    16.1 KB · Views: 59
Similar threads
Thread starter Title Forum Replies Date
Got_All_4 TR2/3/3A Quick Overdrive Wiring Question Triumph 6
ckeithjordan TR2/3/3A Overdrive Wiring Triumph 5
R TR2/3/3A Overdrive wiring installation Triumph 14
S TR2/3/3A Triumph tr3 overdrive wiring Triumph 9
C TR6 TR6 Overdrive Wiring. Triumph 2
S Overdrive Wiring Check Austin Healey 12
BillyB62 TR2/3/3A Type A TR3 Overdrive Wiring Triumph 13
M Stag Wiring plugs for gear lever knob overdrive switch. Triumph 1
Gerry M TR6 Overdrive Wiring Triumph 5
Gerry M TR6 Overdrive Wiring Questions Triumph 10
T TR4/4A Any tips on running the overdrive switch wiring down the steering column? Triumph 11
R TR2/3/3A TR3A Overdrive Wiring Harness Installation Triumph 19
hondo402000 TR6 Need Help on 71 TR6 Overdrive Wiring Triumph 9
KLUTZ Confused with my Overdrive wiring.. Help please MG 3
R BJ-7 overdrive relay wiring problem Austin Healey 1
A Overdrive wiring Triumph 8
S Overdrive Wiring Austin Healey 2
Mickey Richaud Transmission/Overdrive Wiring MG 3
S Removing Overdrive Shaft Lever Pin Austin Healey 7
nevets Reversing With Overdrive "On" Austin Healey 8
Healey Nut Overdrive Relay Austin Healey 1
T Clutch or Overdrive Slip Austin Healey 8
G TR4/4A "Engine seized after engaging overdrive at low speed. Triumph 26
A TR4/4A TR4 Overdrive Solenoid Triumph 19
H TR4/4A A-type overdrive pump Triumph 4
B COMPLETE DROP-IN Rebuilt 1975/6 MG Midget 1500 engine PLUS rebuilt Spitfire Overdrive trans NEVER INSTALLED Spridgets Classified 0
Rob Glasgow New Fangled Electric Overdrive Austin Healey 9
Got_All_4 TR6 Refurbishing gearbox with A type overdrive Triumph 7
J Transmission and Overdrive Rebuild Austin Healey 6
C Overdrive Failure Austin Healey 18
D TR2/3/3A Overdrive question. Triumph 49
D TR2/3/3A Type A overdrive not engaging Triumph 0
D TR2/3/3A Type A overdrive not engaging Triumph 16
BN6_2197 Overdrive engaging with time delay Austin Healey 39
P Broken Overdrive Switch in Gear Knob Austin Healey 14
T Overdrive Problems Austin Healey 18
T TR2/3/3A overdrive solenoid Triumph 3
T Spitfire Overdrive again and again... Triumph 5
BN6_2197 Replacing gearbox switch of the overdrive system Austin Healey 10
G Wanted Non Overdrive gearbox wanted Austin Healey Classifieds 0
T General Tech Spitfire overdrive, the sequel Triumph 3
T General TR Overdrive problem Triumph 4
R Gearbox and Overdrive Oil Level Austin Healey 18
C Overdrive Electrics Austin Healey 8
R gearbox and overdrive Austin Healey 1
M TR4/4A A type Overdrive Oil Leak Fix Triumph 3
M TR2/3/3A TR3 Overdrive filter drain plug Triumph 7
R Overdrive dummy mainshaft Austin Healey 1
J Overdrive Cuts Out when... Austin Healey 11
J Overdrive Cuts Out when... Austin Healey 2

Similar threads

Top