Dual batteries in e350

Discussion in 'Domestics' started by billj, Aug 27, 2017.

  1. jd

    jd Hero Member

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  2. Mobile Dan

    Mobile Dan wrench

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    [​IMG] With a maxi fuse, may be able to remove some plastic and attach a wire with solder or small screw.
     
  3. jd

    jd Hero Member

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    I wonder if the contacts on a maxi fuse are the same as 1/4" solderless crimp terminals. Then we could use a maxi holder and tap an ATO off of it to power the Bosch relay. I haven't been able to find an add-a-fuse tap for maxi. ATO is easy. We need to be careful with this - Our tap connection fails and the van stops. I'd want the Bosch fused, close to the Maxi, so anything wrong with the Isolator circuit wouldn't blow the maxi and disable the van.
     
  4. Mobile Dan

    Mobile Dan wrench

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    Yes, a short and safe distance to an in-line fuse holder for the wire headed to Pin 86 on the Bosch relay would be a good idea. I imagine a 5 or 10 amp fuse would suffice for the small amount of amperage required to energize the Bosch relay coil.
     
  5. billj

    billj MR BILL

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    Wow jd, a lot for an old fart like me to absorb all at one time, but I sure do thank you and I will keep re-reading it.
    The van is an 2006 e350, 5.4 liter, cargo van
    the isolator I plan on using is rated at 80 AMP with a 150 AMP Surge
    Mobile Dan is right on the money as to my goals in his last post. I could not have put it into better words
     
    Last edited: Sep 16, 2017
  6. billj

    billj MR BILL

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    Here is my latest schematic . Note: Batteries final wo fuses.png and isolator to be safely fused before activating
     
  7. billj

    billj MR BILL

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    I noticed that in my owners manual it shows a "15A Back -up lamps, Auxiliary battery relay"

    Located in the Passenger compartment fuse panel, position 12


    Would this be of any use?
























































































    i
     
    Last edited: Sep 17, 2017
  8. Mobile Dan

    Mobile Dan wrench

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    Is the fuse a "true ignition source"? Do you know the location of the AuxBattRelay? If you find that AuxBattRelay and associated circuits work as needed, you could attach to your isolator solenoid and get your new system to work that-a-way.
     
  9. billj

    billj MR BILL

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    The location of the AuxBattRelay is location 20 of the PDBox, PDB fuses 8 and 24.

    I already have everything installed, except frame battery is not in the box yet, and I have not hooked up to a "true ignition source"
     
  10. Mobile Dan

    Mobile Dan wrench

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    Does "everything installed" include the "Bosch relay"?
     
  11. billj

    billj MR BILL

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    Yes sir, and I will be adding a 10Amp inline fuse on the 86 card  back.png
     
  12. billj

    billj MR BILL

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    Question, When hooking up the 10 Amp in-line mini-fuse for the "Bosch Relay" should it be attached to the fused side or the hot side of the 20 Amp Maxi-Fuse for the Fuel Pump when in "true ignition source" mode.
     
  13. Mobile Dan

    Mobile Dan wrench

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    Probably doesn't much matter, but the "fused side" seems like a better choice.
     
  14. billj

    billj MR BILL

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    OK, Tell me what you think (photos) 20 Amp Maxi for fuel pump with 10 Amp piggy back for "Bosch Relay". I also was thinking of putting a little JB Weld Quick Set epoxy over the top of the exposed jumper wire solder connection
     

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  15. JackC

    JackC wrench

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    If you are doing that for insulation, then I would say NO. I believe JB weld is slightly conductive.

    If you are doing it for a better connection then it would be OK, although the solder joint should be fine without it.
     

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