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How to wire an all-synchro overdrive gearbox

Tim Cech

Tim Cech

Silver Level Sponsor
Hello everyone
I just purchased an all synchro with over drive gear box for my 63 alpine 3 and was hoping someone could help me with the wiring? Below you see pics of the wiring on the gear box as well as the parts and pieces that came with. Any help would be hugely appreciated.
Tim
 

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Hey Tim
There is a guy on the mgb forum (Dick Moritz in PA) who is the goto guy for all things over drive. I don’t know if he can help, but he is a lead to issues you are trying to sort through. He helped me out of a jam with my bgt overdrive and while pretty different there are a few similarities (switches) I see in your pictures.
Good luck— hope this helps
 
The wire harness looks worn out and the relay is a different one. Have you check the trans seals? I would replace them with new seals.
British wire has new OD wiring. There was an OD schematic posted here on the forum somewhere.
There are two lockout switches and one is for the backup lights the other is the OD lockout (locks out 1st/2nd & reverse)
Jan
 
Thank you. Im new to all this as I sort of fell into this project unexpectedly. Yes I plan to replace the wiring for sure. The relay came with the trans.
Which seals are you referring to?
 
jumpinjan said:
The wire harness looks worn out and the relay is a different one. Have you check the trans seals? I would replace them with new seals.
British wire has new OD wiring. There was an OD schematic posted here on the forum somewhere.
There are two lockout switches and one is for the backup lights the other is the OD lockout (locks out 1st/2nd & reverse)
Jan
Click to expand...
Would you happen to know which switch is for then OD and which is for the back up lights?
 
Mike O'D said:
I thought it was down to engage and up to disengage the OD switch.
Click to expand...
Yes, but I believe Jeff may have created this while on holiday in Australia.

What confused me was the bit about 'siring'... I wasn't aware there was going to be any biological content on this job. Having said that, I'm always up for a good time.

;)
 
How you connect the wires to the switch and orient the switch will determine whether up or down is engagement.
 
Mike O'D said:
How were they set up from the factory?
Click to expand...

Mike,

This is from the sII Owners Manual. It follows the normal UK convention on electrical switches - up is off and down is on.

1772291465148.png

The sV Owners Manual description only states: ". . .move switch in appropriate direction. . ."

The sV Owners Manual switch operation description is essentially a "cut and paste" of the information found at the sII's O/M "on page 30."

I would vote for the self cancelling switch following the same convention as the sII's switch, but that's only a logical conclusion. I've been known to be wrong. ;)

Have fun,
 
Thanks Don. I saw that in the SV manual and thought it was pretty funny. By SV production, maybe the factory was just randomly hooking them up!
 
I believe there could be a simple explanation here.

On a right hand drive Alpine, the overdrive switch is on the left-hand side of the steering column. On the left-hand drive Alpine, the overdrive switch is on the right hand side of the steering column. If you only use one part number for the switch, and, given it is spring loaded in only one direction, and that the handle is angled (preventing simply inverting the switch), then by flipping it from one side to the other, it would thereby change the operational direction of the switch. Hence the vague description in the Series 5 manual - it had to cover both contingencies. This also could explain the drawing - it may be showing a RHD installed switch.
 
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On my stock LHD 62' S2 w/od.. Up is disengaged and down is engaged. wiring orientation would make a difference.

.... David
 
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