THE INTERNATIONAL JAGUAR 'S'-TYPE REGISTER FORUM

CSSType wrote: ↑Mon Feb 22, 2021 12:02 am Connected to ignition light directly without the relay - nothing. It doesn’t light up. Swapped terminals on relay - nothing. So I don’t know. It’s frustrating.

Are you sure the IGN bulb is not blown?

See previous post for ammeter.

According to the wiring diagram there is a Brown/Yellow wire that went from the small terminal on the old dynamo to the old terminal D on the voltage regulator. D is directly contacted to W/LT on the regulator and this Brown/Yellow wire goes direct to the warning light. This is the wire W/LT that you disconnect from the voltage regulator and connect to the small terminal on the new Dynalite.
From the other side of the ignition warning light there is a White wire that runs via the Hand brake warning light to fuse 3.
If your warning light is not coming on you can do a couple of things.
1st check with the ignition on but engine off that there is a current running from the White wire going from fuse 3 to the ignition warning light. What I think happens is the White wire is power and the Small terminal on the Dynalite acts as an earth which is switched off when the alternator is generating power. If you ground out the Brown Yellow wire the ignition light should come on.
If the Brown Yellow wire is ground out but the ignition light does not come on, Check fuse 3. Check continuity between the fuse 3 and the ignition light. Check continuity between the ignition light Brown/Yellow wire and the small terminal end of that wire.
And as CSSType has suggested check the bulb in the ignition light.
Hope this makes sense.

Thank you gentlemen ! I think I will just convert to negative earth and use an Alternator...



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converse a

See attached Lucas Service Bulletin
Cheers
David