I have a 5 ton fraightliner truck with 3 battery's to start & i have a cable for battery's coming into my cargo box to

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Customer: i have a 5 ton fraightliner truck with 3 battery's to start & i have a cable for battery's coming into my cargo box to operate some 12 volt (burner motor)anyway if i let these fan on for a while when i am working it kills the battery's of my truck than i need to find a boost.i was told to get a battery isolator now is the ? at princes auto i seen some with 3 bolts on them and doing a search on the web i have seen some with 4 bolts is the a specific 1 that i need.
and can i just hook the isolator from inside the cargo box to operate my burner motor or i need to come directly from my alternator? thank you for your answer phil
Answered by don in 12 hours 13 years ago
Auto Mechanic

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Specialities include: Auto Body Technician, Heavy Equipment Repairs, Diesel Engine Repairs, Brake and Transmission Repairs

hi there my name is don i will try to help you on this

here is a diagram of how to hook it up i would reccommend the diode style isolater much more efficient and you do not lose as much power discharging as the other type
hope this helps you

diode based isolator
heres the information i dug up for you
i am also in canada near edmonton '

Battery Isolators:
Many people listen to their stereo without the engine running. This often leads to dead batteries and a vehicle that won't start. A battery isolator will let you completely discharge one battery without discharging the starting battery.


Different Types of Isolators:
There are 2 main types of battery isolators. The diode based type and the relay (solenoid) type.


Diode Based Isolator:
This type of isolator is basically two very high current diodes in a heat sink. The diode based isolator has the advantage of long life and trouble free operation but many of the diode based isolators cause a .4 to .6 volt loss which means that the batteries will not charge to as high a voltage as when they are connected directly to the alternator. The diagram below shows the connection for the diode based isolator. Some diode type isolators have a fourth terminal which controls the current flow through the device.
hi there and thanks for tthe accept it was my pleasure to assist you have a great day
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