• Hi Guest!
    If you appreciate British Car Forum and our 25 years of supporting British car enthusiasts with technical and anicdotal information, collected from our thousands of great members, please support us with a low-cost subscription. You can become a supporting member for less than the dues of most car clubs.
    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this gawd-aweful banner
Tips
Tips

TR2/3/3A Switches on the top of an Overdrive

Share this page

71TR6

71TR6

Jedi Hopeful
Country flag
Offline
Hello All- I’m wiring up a TR4 overdrive unit that I installed into my TR3A and notice there are three switches on the top of the case. I think I’ve correctly wired up the lockout switches (confirm, please?) but I have no idea what the third switch is for. Does anyone have any idea what this does? Secondly, where should the OD harness ground ring attach?
IMG_3115.jpeg
 
71TR6 said:
Hello All- I’m wiring up a TR4 overdrive unit that I installed into my TR3A and notice there are three switches on the top of the case. I think I’ve correctly wired up the lockout switches (confirm, please?) but I have no idea what the third switch is for. Does anyone have any idea what this does? Secondly, where should the OD harness ground ring attach?View attachment 98330View attachment 98330
Click to expand...

71TR6 said:
Hello All- I’m wiring up a TR4 overdrive unit that I installed into my TR3A and notice there are three switches on the top of the case. I think I’ve correctly wired up the lockout switches (confirm, please?) but I have no idea what the third switch is for. Does anyone have any idea what this does? Secondly, where should the OD harness ground ring attach?View attachment 98332
Click to expand...
I believe the 2 switches are correct. The 3rd switch is for a reverse light. . The ground is easily attached under any of the bolts holding the top cover onto the tranny.
Charley
 
Back
Top