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[Kingbrown]

A few simple checks that you can make if not already done:

> Is the alternator (field /excitation) fuse ok ?

> Is the fuse(s) that supplies the charge warning light circuit ok ?
(when the alternator isn't charging,...

[Kingbrown]

And some related discussion (Gen 4) here:

https://www.pajeroforum.com.au/forum...ess-prevention...

[Kingbrown]

Maybe the idle air control valve (IAC) is playing up ?🤔

[Kingbrown]

Ahh, of course. The blessed 'smart' alternator. That explains it.
Thanks for clarification....

[Kingbrown]

Stepping back to the original premise, are you sure the Ctek needs an ignition switched source ?

Mine simply (admittedly a 12yo unit) relies on the main feed voltage to determine whether the engine is running or not and thus whether to connect...

[Kingbrown]

Well, up to a point.
An MPPT regulator will dither around the knee point of the panel's output (V vs I) and suitably load the panel to get the most power from it....