Installed Dual Batt.. need some help

[Wylietunes]

and blew the starter battery fuse I installed

Is this one of the 80A fuses installed between the batteries and ACR? If so, then you have something regarding the new switch and ACR that is majorly wired incorrect.

The alternator will not have any effect on the engine starting or not. Only charging or not charging once engine is running. So, if you are unsure of how the new alternator needs to be wired, put the old back in as it was originally for now.

To diagnose this, you will need a digital volt/ohm meter, and know how to use it. Once the cranking issue is resolved, you are going to need an accurate schematic for building the dual bank system.

[SeattleBoat]

Is this one of the 80A fuses installed between the batteries and ACR? If so, then you have something regarding the new switch and ACR that is majorly wired incorrect.

The alternator will not have any effect on the engine starting or not. Only charging or not charging once engine is running. So, if you are unsure of how the new alternator needs to be wired, put the old back in as it was originally for now.

To diagnose this, you will need a digital volt/ohm meter, and know how to use it. Once the cranking issue is resolved, you are going to need an accurate schematic for building the dual bank system.

I'm pretty sure all the wires are routed correctly. I did put in the original alternator and wired it back to stock.. but no dice. Maybe the battery is too low? I had them checked.. both were good.

Yes.. that 80amp fuse is between battery and ACR.

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[Wylietunes]

I'm pretty sure all the wires are routed correctly. I did put in the original alternator and wired it back to stock.. but no dice. Maybe the battery is too low? I had them checked.. both were good.

Yes.. that 80amp fuse is between battery and ACR.

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Your 2ga and 80A fuse is fine, id leave it as long as the terminations are correct. You've already proven it works, as the fuse blew v's the 2ga melting down

However, I dont see how that fuse blew. Seems that there was a dead short between the 2 batteries. As if one was reversed polarity. Is the control ground the only circuit on the ACR, you are using? Thats one of the small blade terminals along the bottom. Or are you using the SI?

[SeattleBoat]

Your 2ga and 80A fuse is fine, id leave it as long as the terminations are correct. You've already proven it works, as the fuse blew v's the 2ga melting down

However, I dont see how that fuse blew. Seems that there was a dead short between the 2 batteries. As if one was reversed polarity. Is the control ground the only circuit on the ACR, you are using? Thats one of the small blade terminals along the bottom. Or are you using the SI?

The ACR is connected to the small ground, going to a bussbar. I also have the LED going to the accessory side on the switch.. maybe i should change that to the house? Not that it is causing the issue.

I do have a question in regards to the bussbar. I connected the ground from the engine to the bussbar, along with the negative battery terminals to the bussbar. Do you think it's wise to have the engine ground go to the bussbar or should it go directly to the negative battery terminal instead?

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[Wylietunes]

I also have the LED going to the accessory side on the switch

So you are using the remote indicator (LED) terminal off the ACR? That output terminal is wired to the negative side of an LED and the LED is wired to switch? Or sis you run a wire from the LED terminal direct to the switch with no LED in the middle with correct polarity?

Your ground BUS is fine, as long as the ground cables between the BUS and batteries is of proper gauge.

Also looks like there are only 3 cables exiting the switch. I presume main starter cable, cranking battery and house battery. Are there no house loads?

[SeattleBoat]

So you are using the remote indicator (LED) terminal off the ACR? That output terminal is wired to the negative side of an LED and the LED is wired to switch? Or sis you run a wire from the LED terminal direct to the switch with no LED in the middle with correct polarity?

Your ground BUS is fine, as long as the ground cables between the BUS and batteries is of proper gauge.

Also looks like there are only 3 cables exiting the switch. I presume main starter cable, cranking battery and house battery. Are there no house loads?

I think you may have helped me. I just spoke with West Marine and was told that my wire coming off the ACR LED is not supposed to go to my switch. That is causing the ACR to ground out. It's supposed to go to a light indicator on my dash...

Will be getting my circuit breaker tomorrow morning and try this all out then..

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[SeattleBoat]

No dice.. video link below of me trying to start it.

Replaced the 50 amp circuit. Connected back to stock, power and ground off engine straight to a charged battery (was charged to 100% on my charger before starting). Have the new Mando alternator installed correctly w/ the exciter wire, ground and power. But it wont turn.

Looks and feels like a bad battery.. this is my 3rd battery I've had lying around that was charged. Could this be a starter possibly? I don't have knowledge on checking voltage across everything.. but that is what i should learn to do asap.

EDIT: I did get it to turn much more than that when I pulled my truck battery out for a quick test. So I know the engine isn't siezed thank the lord.. but it did have me worried. This vid below shows on the boat battery..

Any thoughts? Vid below