Thanks very much Dennis. This is what I had hoped. Had found "double"
relay images and now see this "can" type diagram (though for starter)
http://www.hqew.net/files/Images/Article/Circuit_Diagram/BasicSolenoidCircuitDiagram_thumb.png
  I see the two air gaps.

I'll be curious to see how much current this "can" type draws.

Neil.

On Wed, Mar 13, 2013 at 11:36 AM, Dennis Haynes <d23haynes57@hotmail.com> wrote:
> The can type relays are double break type. What that means is there are two air gaps when they open. Arc suppression and better chance of the circuit opening.
>
> Dennis,
> And I still can't type on this Windows 8 Phone!
> ________________________________
> From: neil n<mailto:musomuso@gmail.com>
> Sent: 3/13/2013 1:28 PM
> To: Dennis Haynes<mailto:d23haynes57@hotmail.com>
> Cc: vanagon@GERRY.VANAGON.COM<mailto:vanagon@gerry.vanagon.com>
> Subject: Re: Alliance Deep Cycle? (Grp. 27) Wire To Alternator?
>
> Way cool re: Alliance. Much less $ than a Trojan SCS150
> http://www.trojanbattery.com/Products/SCS15012V.aspx
>
> I'll google "double break relay". Would a "can" type solenoid isolator
> suffice instead? They were on sale at Princess Auto.    ;^)
> I will fuse charge line and load line to fridge.
>
> The existing driver side aux. battery solenoid "can" type isolator is
> actuated by the alternator blue wire (D+)
>
> Easy to measure the "can" isolator current draw, but blue wire gauge
> aside, will the (presumably) higher current demands of 2 "can" type
> battery isolators etc. adversely affect the alternator regulator?
>
> Thanks
>
> Neil.
>
> On Wed, Mar 13, 2013 at 5:21 AM, Dennis Haynes <d23haynes57@hotmail.com> wrote:
>
>> The Alliance brand is reasonably priced even at the Freightliner dealer. BTW
>> an 8 gauge charge line is ideal. Use a good size double break relay and be
>> sure to control it so the relay is not closed while cranking the engine.
>> Otherwise that line will see some starter current. Consider some type of
>> over current protection. You have power on both sides. I like fusible links.
>> Cheap and easy.
>>
>> Dennis,
>> And I still can't type on this Windows 8 Phone!
>> ________________________________
>> From: neil n
>> Sent: 3/13/2013 1:46 AM
>> To: vanagon@GERRY.VANAGON.COM
>> Subject: Re: Alliance Deep Cycle? (Grp. 27) Wire To Alternator?
>
>
>> At $125.96 Cnd. for a group 27, I have to wonder if it's the same
>> battery as the Alliance you write of.
>
>
>
> --
> Neil n
>
> 65 kb image Myford Ready For Assembly  http://tinyurl.com/64sx4rp
>
> '88 Slate Blue Westy to be named.
>
> '81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/
>
> Vanagon VAG Gas I4/VR Swap Google Group:
>
> http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines

--
Neil n

65 kb image Myford Ready For Assembly  http://tinyurl.com/64sx4rp

'88 Slate Blue Westy to be named.

'81 VanaJetta 2.0 "Jaco"  http://tubaneil.googlepages.com/

Vanagon VAG Gas I4/VR Swap Google Group:

http://groups.google.com/group/vanagons-with-vw-inline-4-cylinder-gas-engines