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<blockquote data-quote="ntsqd" data-source="post: 43806" data-attributes="member: 222">Cole Hersee makes a constant duty solenoid just for this purpose, separating batteries when the ign is off. You can't push starter current thru it, but it'll handle everything else.My general practice when adding stuff to an existing wiring system that has two batteries is to wire all of the added loads the the second battery. One option I like for hard service vehicles with separated batteries is to wire a Ford starter solenoid to put the batteries in parallel for self jump starting. Pull the solenoid's power from the second battery.I've seen that advice about the two batteries needing to be the same or they will see-saw discharge each other many, many times. While I think it is a good idea to match the batteries, I think the damage potential (no pun intended) to the batteries is commonly overstated. A case in point is my '79 Suburban. It came with the dual battery option. They are wired directly in parallel from the factory, no isolator. One original battery is listed on the option sheet as having nearly a 1/4 again more capacity than the other battery.TSI used swerve around my halucinations, now I drive right thru them.</blockquote>

[QUOTE="ntsqd, post: 43806, member: 222"] Cole Hersee makes a constant duty solenoid just for this purpose, separating batteries when the ign is off. You can't push starter current thru it, but it'll handle everything else. My general practice when adding stuff to an existing wiring system that has two batteries is to wire all of the added loads the the second battery. One option I like for hard service vehicles with separated batteries is to wire a Ford starter solenoid to put the batteries in parallel for self jump starting. Pull the solenoid's power from the second battery. I've seen that advice about the two batteries needing to be the same or they will see-saw discharge each other many, many times. While I think it is a good idea to match the batteries, I think the damage potential (no pun intended) to the batteries is commonly overstated. A case in point is my '79 Suburban. It came with the dual battery option. They are wired directly in parallel from the factory, no isolator. One original battery is listed on the option sheet as having nearly a 1/4 again more capacity than the other battery. TS I used swerve around my halucinations, now I drive right thru them. [/QUOTE]

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