Battery-Cables-&-Accessories > Battery-Isolators

Cole Hersee Battery Isolators - 1/4" Studs

Cole Hersee Battery Isolators: Reliable Power Management for Dual Battery Systems

Cole Hersee Battery Isolators ensure reliable performance in vehicles with dual battery systems by preventing the battery with a higher charge from draining into one with a lower charge, helping to avoid electrical system failure. These isolators electrically separate the batteries while allowing them to be charged simultaneously from a single power source, providing efficient and safe charging. Designed for general-purpose use, they are compatible with negative ground alternator systems ranging from 12V to 36V DC and support alternator outputs from 70 to 250 amps.

The amp rating of each isolator corresponds to the maximum alternator output, while the "per leg" rating specifies the maximum current delivered to each battery—half the total alternator rating. For instance, Del City Item #948051, rated at 75A, can deliver 37.5A per leg. Built with embedded electronic components for protection against adverse conditions and an integral heat sink for effective heat dissipation, these isolators are durable and suitable for tough environments. Please note that Cole Hersee battery isolators are designed for negative ground systems and are not recommended for self-energizing alternators.


  • General purpose Isolators for 12-36V DC negative ground alternator systems.
  • Rated for use with systems ranging from 70 amps to 250 amps output.
  • Embedded electronic components to protect from adverse conditions.
  • Integral heat sink to provide heat dissipation.
  • Download spec sheet here.
Item Description Price
1+ I Ext. Price I 5+ Ext. Price I
Qty in
Package
In Stock Add to Cart
948051 Cole Hersee 48051, Battery Isolator, Two 1/4" Studs, 75 Amp (1 MIN) drawing
119.01600 119.02 I 107.11200 107.11
1 EA Call
948070 Cole Hersee 48070, Battery Isolator, Three 1/4" Studs, 70 Amp (1 MIN) drawing
56.91600 56.92 I 51.22200 51.22
1 EA Call
948090 Cole Hersee 48090, Battery Isolator, Three 1/4" Studs, 90 Amp (1 MIN) drawing
65.19600 65.20 I 58.67400 58.67
1 EA

Cole Hersee Battery Isolators - 5/16" Studs

Cole Hersee Battery Isolators: Protect and Charge Dual Battery Systems

For vehicles with two batteries, Cole Hersee Battery Isolators ensure efficient power management by electrically preventing the higher-charged battery from draining into the lower-charged one, helping to avoid electrical system failures. These isolators allow both batteries to charge simultaneously from a single source while keeping them electrically separated. Designed for general-purpose use, Cole Hersee offers isolators rated for negative ground alternator systems with outputs ranging from 70 to 250 amps (12-36V DC).

Each isolator has a "per leg" rating, indicating the maximum current it can supply to either battery. This rating is always half the alternator's maximum output. For example, Del City Item #948051, rated at 75A, can deliver up to 37.5A per leg. Built for durability and reliable performance, Cole Hersee isolators are intended for negative ground systems and are not suitable for use with self-energizing alternators.


  • General purpose Isolators for 12-36V DC negative ground alternator systems.
  • Rated for use with systems ranging from 70 amps to 250 amps output.
  • Embedded electronic components to protect from adverse conditions.
  • Integral heat sink to provide heat dissipation.
  • Download spec sheet here.
Item Description Price
1+ I Ext. Price I 5+ Ext. Price I
Qty in
Package
In Stock Add to Cart
948120 Cole Hersee 48120, Battery Isolator, Three 5/16" Studs, 140 Amp (1 MIN) drawing
103.49 103.49 I 93.14 93.14
1 EA
948122 Cole Hersee 48122, Battery Isolator, Three 5/16" Studs & One #10 Stud, 140 Amp (1 MIN) drawing
124.19 124.19 I 111.77 111.77
1 EA
948160 Cole Hersee 48160, Battery Isolator, Three 5/16" Studs, 200 Amp (1 MIN) drawing
134.54 134.54 I 121.08600 121.09
1 EA
948161 Cole Hersee 48161, Battery Isolator, Three 5/16" Studs, 250 Amp (1 MIN) drawing
310.49 310.49 I 279.44 279.44
1 EA Call
948162 Cole Hersee 48162, Battery Isolator, Three 5/16" Studs & One #10 Stud, 200 Amp (1 MIN) drawing
150.06600 150.07 I 135.05700 135.06
1 EA
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