Reverse light switch interchangability

Technical Area Engine, Transmission, Exhaust etc
1

Hello all.

As per the title, will the Mk1 reverse switch work in a mk2 gearbox?

Not for the first time, my senses left me and whilst diagnosing why my reverse light doesn’t work properly since my Rocketeer conversion - I completely forgot that my gearbox is from a NB/Mk2. I’ve been trying to get my reverse light to work using a mk1 switch.

Now, it seems to screw in to the gearbox fine and I know that the gearboxes themselves are interchangeable, so this might be a red herring.

The switch was purchased new (and is genuine Mazda) a few months ago. When I connect the switch the reverse light stays on regardless of what I do with the plunger on the switch.

I’ve tested the wiring from the car (one shows correct live voltage and the other is not live) and obviously the light unit/bulb is working - so I ordered ANOTHER new switch.

8
81512×2016 259 KB

6
61512×2016 208 KB

4
41512×2016 245 KB

2
21512×2016 333 KB

However it hit me this morning through a conversation with @Benji93 (thanks mate!) that my gearbox was from the NB.

Anyway, that was quite a ramble!

Thanks in advance.

Andrew

2

Most list these a being different but I think they should be exactly the same, although the back end electrical connection is different.
Very easy to test with a multimeter and just press in the probe for continuity.
The only other memory I have is that there may be a spacer washer or two required when fitting. If that is right and you have fitted without the spacer washers, may account for the light on, in reverse or not?

3

Hi rhino, thanks for the reply.

The switch doesn’t seem to be supplied with a washer.

I’ll have to see if I can find the thread size and order one seperately.

Thank you :slight_smile: