Cole Hersee 48090 Heavy Duty Battery Isolator, 90A
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Cole Hersee 48090 heavy duty battery isolator helps manage DC negative ground battery systems by isolating each battery so charge from the higher-charged battery doesn’t drain into the other—while still allowing simultaneous charging from a single power source.
Key Features
- For DC negative ground electrical systems
- Isolates batteries to help prevent the higher-charged battery from draining into the lower-charged battery
- Allows two batteries to be charged simultaneously from a single power source
- 90 Amp rating per leg (2 legs)
- Three 1/4" stud terminals
Product Compatibility
- Marine and power sports DC electrical systems
- Auxiliary battery and multi-battery setups requiring isolation and shared charging
- Heavy-duty applications that use DC negative ground battery wiring
Product Details
- Cole Hersee battery isolator: 48090
- Rating: 90A per leg, 2 legs
- Terminals: three 1/4" stud terminals
- Overall size: 6-1/2" L x 3-1/4" W x 2-13/6" H
Parts Desk Insights
Best Use Case: Use when you have a main battery and an auxiliary battery (or two battery banks) and want each battery isolated from back-drain, but still able to receive charging from one charging source.
Common Issues: Confirm you’re working with a DC negative ground system. Also double-check terminal layout/stud sizes during installation so ring terminals and battery cables match the provided 1/4" stud terminals, and verify cable routing and mechanical clearances for the isolator’s overall dimensions.
Related Products & Accessories
- Battery Isolators & ACRs - Browse other isolators and battery control accessories for multi-battery charging setups.
- Electrical & Accessories - Explore related electrical components such as battery wiring accessories and charging-system parts.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.