Recommended Battery Isolator for 220 Amp Alternator in Class A Motorhome

Question

Question:

I have two 6 volt golf cartinch batteries in my 30foot Class A motorhome as house batteries. I know there is an isolator being used, can hear it clicking. A couple of years ago, I replaced the original 130 amp alternator with a 220 amp one when it became obvious the original one was failing. Everything was fine, and a year ago I replaced my 6 year old golf cart batteries Batteries Plus. But this year, Im on my annual trip South, and suddenly notice digital meter that while going down the road those golf cart batteries two 6 volt wired in series are reading in the 11 volt range instead of the previous 13 volt range, and wonder if the years old isolator is failing. Reading about isolators on your website it looks like the isolator needs to be rated ABOVE 220 amps. Am I correct on this? Thanks for reading.

asked by: Ron H

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Expert Reply:

In regards to battery isolators, they should be rated at or close to the changing amperage rating of your alternator. They don't really need to exceed this as it's very unlikely your alternator will ever reach its max charging amperage. I recommend the Redarc Smart Start Battery Isolator part # 331-SBI212 which is rated at 200 amps. This isolator has a ton of great features like the ability to connect to an LED (not included) that can be mounted in your cab for easy viewing of diagnostics. It comes with a tow year wrranty.

expert reply by: Conner L

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Answer 1

Hey Steve, so the most similar option that would be an upgrade to what you have now would be the Redarc BCDC charter part #331-SBI12-BLD which will do a great job managing all of the batteries in your setup that need to be charged. This has an output…

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Answer 2

In regards to battery isolators, they should be rated at or close to the changing amperage rating of your alternator. They don't really need to exceed this as it's very unlikely your alternator will ever reach its max charging amperage…

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Answer 3

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 4

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 5

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 6

I did some checking and the hub/drum we offer that will work for you is the part #8-430-5UC3. This uses the same bearings as the 8-415 and will be an exact fit aside from the fact this is a non-ABS setup and the 8-415 came in an ABS setup and non-ABS…

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Answer 7

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 8

If you just need a 4-pin to 7-pin trailer wiring adapter, then you can use part #C57672. This will plug into the 4-pin trailer connector on your brother's vehicle and give him the 7-pin socket for the trailer. Keep in mind, this will only give…

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Answer 9

The first thing you will need for your 1999 D250 is a 4-way. The Curt T-Connector Vehicle Wiring Harness #C55317 plugs into the connection points behind your rear bumper and will allow you to power your trailer's signal lights. Once the 4-way is…

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Answer 10

If you have a vehicle specific wiring harness for a brake controller then that would indicate that you have a factory tow package and subsequently would already have a 7-way at the back of your vehicle. The universal 7-way connector #ETBC7 is meant…

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Answer 11

Hey Antoine, so the two kits you mentioned are actually really similar and honestly I would go with the part #ETBC7 if I were you. The #ETBC7L is basically the same thing minus a couple wires and breakers so you may as well get the kit that has…

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Answer 12

For your 2024 Hyunda Santa Cruz we have the Curt 7-way kit part #C68JR that is a confirmed fit. This installs by plugging into a factory wiring connector on your vehicle which means a really easy install that doesn't require any splicing.

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