Missing overdrive relay!!!

[Bazza]

Apologies if this has already been asked.

Overdrive on my recent purchase of MKIV Spitfire does not work. Before getting underneath thought I would check the obvious wiring to switch and relay. 
However unable to locate the relay which i understand should be beside the horn relay on the bulkhead. There is one wire labelled (with very faded masking tape) ‘overdrive’ which is attached to an in-line fuse and would appear to be wired into the ballast resistor. Please see photos.

All advice greatly appreciated 

Thanks

Barry

[SpitFire6]

Looks like a ballast resistor.

Is it a J-Type OD?

Edited July 31, 2020 by SpitFire6
Cannot read

[Colin Lindsay]

1 hour ago, SpitFire6 said:

Looks like a ballast resistor.

Is it a J-Type OD?

Yep, J-type don't have one - they take the power straight from the reversing light circuit. 

If you want to see what it looks like, have a look at my 'GT6 blowing fuses' thread in the Electrical section - photos on page 2.

[Pete Lewis]

running a feed from the 12v side of the ceramic ballast is ok its going to be ignition switch controlled and full 12v 

if on the ballsted 6v side of the resistor then the OD will be very likely slow or inoperative 

pete

 

 

[Bazza]

Hi All

thanks for your replies - yes it’s a J type OD - didn’t realise this didn’t need/have a relay (new to this).

Any advice re sorting OD would be appreciated.

Barry 

[Pete Lewis]

the solenoid on J type is passenger side , can yuo get under and find the feed .add a bulb or meter is there a supply to the sol.

selection is inhibited with a switch on the front of the gear remote to only get OD in 3rd 4th. this needs the tunnel removing 

often wiring faults here or simple adjustment .

if the OD switch is in the gear knob the wires down the stick go hard and fail.

pete

 

[Bazza]

Thanks Pete will try that for starters. Appreciate the advice 

Barry