MGB Unknown connector on alternator

[TheRealDestrux]

Hello, I replaced my alternator on my 1977 MGB, it’s making about 15.2 volts to the battery (a little high) and I’ve been having some issues, my high beams aren’t working, my reverse lights sometimes work and sometimes don’t, my wipers stopped working, and blinkers also sometimes work or not. This happens with the car running and also not running. I didn’t have this issue before. (Besides the blinkers)

However I did find this connector connected to the alternator harness and don’t know if this is important and possibly creating my issue on my 1977 MGB, it’s not plugged in and I haven’t found the other end yet.

Thank you.

 

[TheRealDestrux]

Short update: The lights and wipers are fixed, the bullet connectors behind the dash are loose in their connector and I will replace them.

Still want to find out what that connector goes to though.

 

[JPSmit]

what colour are the wires leading to the connector?

 

[TheRealDestrux]

what colour are the wires leading to the connector?

Sorry for the late reply. They seem to be, white and green, white, white and black.

 

[JPSmit]

So, not sure exactly which is which but it seems to be connected to the Opus Ignition / CEI ignition - and possibly the ignition amplifier. This MG's attempts at electricronic ignition with mixed results.

One of these links - should be relevant.

mgexp.com/forum/mgb-and-gt-forum.1/distributor-coil-amplifier-wiring-question.891592/

1980 CEI ignition diagram??? (Page 2) : MGB & GT Forum : The MG Experience

Hi, Does anyone have the wiring diagram for the late 1980 MGB (or as used for 1977-1980 MGB as the recall replacement) CEI distributor setup? I seem to find the OPUS wiring diagrams everywhere but have had no luck with the CEI system (the one with the separately mounted amplifier).

www.mgexp.com

https://www.mgexp.com/phile/1/99150/Later_Electronic_Ignition-2.jpg

 

[Mickey Richaud]

Those colors are all associated with the ignition circuit, but I don't remember seeing that type connector before. And if the car starts and runs, I'm not sure it's needed; but also not sure why it's there. Hopefully, someone with more knowledge will chime in (Doc, you readin'?). In the meantime, if you don't already have it, here's a link to color-coded wiring diagrams for all MGB models; scroll down to the '77 for yours.

Keep us posted on your findings.


Mickey

 

[TheRealDestrux]

Those colors are all associated with the ignition circuit, but I don't remember seeing that type connector before. And if the car starts and runs, I'm not sure it's needed; but also not sure why it's there. Hopefully, someone with more knowledge will chime in (Doc, you readin'?). In the meantime, if you don't already have it, here's a link to color-coded wiring diagrams for all MGB models; scroll down to the '77 for yours.

Keep us posted on your findings.


Mickey

Now that you mention it, my alternator was bad and the ignition light never came on, nor has it ever come on. So this connector probably shows me when I have an issue such as that. However I do not know where it connects.