Does E Circuit of Isolator DW08770 Need to Be Completed

Question:

I have a small motor home and need to replace the battery isolater. The one that I have only has 3 terminals. Alternator in, main battery out, secondary battery out. Can I just install the DW08770 without having to run the E wire? Will it still work properly?

asked by: Chip S

Expert Reply:

The E circuit needs to be completed on the # DW08770 in order for the circuits of the isolator to be completed. If that circuit does not run to a 12 volt source it would not allow the circuits to complete. Typically this is ran to a keyed power source so that the circuits are only active when the vehicle is running. So basically you have to run it to a power source to turn it on. You can do this by running it to a power source that is on all the time if you have no need for it to turn off and on with the key of it.

expert reply by: Jameson C