Smart alternator by pass

Looks like the new Isuzu/Mazda BT50. Lucky man:-)

I don't know how "smart" that smart alternator system is. Mazda can and does, alter some specs and make them different from the partner vehicle. My 2014 BT50 has a different alternator system from its 2014 Ford Ranger counterpart. If you're trying to work out whether or not to use the low voltage IGN wire, best try and get some info from your dealer's service department.

Warren, a lot depends on exactly what loads the ECU deems warrant leaving the voltage alone and not tampering with it. In my own vehicle, running th ventilation fan - which we ALWAYS DO - is enough to outsmart the "smarts". Every vehicle is different in this regard, on some the parking/DRL's will do it.

If you can't find that out (either by trial-and-error or quizzing the Mazda service dept) then the IGN connection is the only way to be sure the DC-DC isn't being defeated by the alt voltage droop.

P.S. Made in Thailand I see.

Warren
New Mazda unseen, I cannot be sure, but the other terminal ( above the battery post itself in picture) seems to be connected via a shunt around in a U shape to the main battery terminal. I would think the DC DC unit has to be earthing at THAT, NOT directly at the battery terminal ( not marked with red arrow terminal) which would subsequently be connected to chassis AND the side body earthing cable. Is there some thinner wiring, ie, two wires which connect to either end of the U shaped shunt thingo? If so it would be the detection point for load which Frank was alluding to.

Yes, to the chassis at the right hand arrow, or to the other end of that cable if it's more convenient - makes no difference.