Smart alternator by pass
Submitted: Tuesday, Mar 16, 2021 at 13:05
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WARREN H7
Which of these is betterto wire to with a smart alternator in play
Also if ok above would you still wire your DC-DC charger to the ignition

wiring picture BT 50
Reply By: Frank P (NSW) - Tuesday, Mar 16, 2021 at 13:44
Tuesday, Mar 16, 2021 at 13:44
It looks to me that you have some smarts on the negative battery post. Therefore, IMHO and without knowing more detail, the safest place for all added negatives is the chassis.
AnswerID:
635608
Reply By: WARREN H7 - Tuesday, Mar 16, 2021 at 13:46
Tuesday, Mar 16, 2021 at 13:46
Thank mate have to the right with - earth from battery
My setup will be 50a breaker near start battery
DC-DC in rear and going to put 50a breaker near battery ans one more 2nd battery out using
25A 5 STAGE INTELLI-CHARGE 9-32V LITHIUM DUAL BATTERY CHARGER
Hope no ignition connection
Can all - be connect with anderson plugs

DC- DC Charger
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635609
Follow Up By: Frank P (NSW) - Tuesday, Mar 16, 2021 at 14:24
Tuesday, Mar 16, 2021 at 14:24
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.
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Follow Up By: Zippo - Tuesday, Mar 16, 2021 at 14:57
Tuesday, Mar 16, 2021 at 14:57
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.
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Follow Up By: RMD - Tuesday, Mar 16, 2021 at 15:40
Tuesday, Mar 16, 2021 at 15:40
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.
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Follow Up By: Frank P (NSW) - Tuesday, Mar 16, 2021 at 17:17
Tuesday, Mar 16, 2021 at 17:17
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.
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