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Old 08-18-2014, 01:08 PM   #51
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If there is current flowing when you disconnect a terminal, you risk a spark between the cable connector and the terminal... and that is true with either terminal.

The advantage of disconnecting the negative terminal first is that there is no voltage difference between it and the trailer frame or other "grounded" things which you might accidentally touch with tools or your body: that means minimal shock/spark hazard. If the first one you disconnect is the positive side, and you touch it with a wrench, there is a risk of touching a grounded point with the other end of the wrench and getting a big spark due to the resulting short circuit.
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Old 08-18-2014, 01:32 PM   #52
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When I was shopping batteries, Battery World at 1st and Boundary, Vancouver, was cheapest by far for what I was comparing (Trojans).
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Old 08-18-2014, 02:27 PM   #53
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When I was shopping batteries, Battery World at 1st and Boundary, Vancouver, was cheapest by far for what I was comparing (Trojans).
Perhaps a bit off topic Jamie, but if I hooked up 4 Trojan T-125's together, that'd give me some impressive amp hours, would it not? Only concern is the weight.
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Old 08-18-2014, 02:30 PM   #54
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These may be available in Canada locally from Sears:
Sears.com (link to Sears Marine Deep Cycle Battery on sale).
Searched "Sears Canada deep cycle battery" and found this. Note, Sears Canada is close to going under.
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Old 08-18-2014, 03:14 PM   #55
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Perhaps a bit off topic Jamie, but if I hooked up 4 Trojan T-125's together, that'd give me some impressive amp hours, would it not? Only concern is the weight.
Lets see, 4 Trojan T-125's equal 6.4 KWh and 120 Kg.

Nope, not for me. I'm holding out for the mystical 5 KWh, 15 Kg lithium rechargeable for about $100 US.



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Old 08-18-2014, 03:18 PM   #56
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Time to put this one to bed.
Used the voltmeter at a DC outlet and it was bouncing between 11.94 and 12.06. Tested a cell with the hydrometer and got 12.75 or better.
Applied a baking soda solution to the terminals and cleaned them to ensure contact.
Voltmeter now reads 12.61 ( that's after two days off shore power ).
Thanks to all.
Memo to self: any electrical issue; first check and clean contacts.
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Old 08-18-2014, 03:19 PM   #57
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I saw the same issue: the Sears link is redirected for those of us in Canada to a generic entry page, rather than the intended battery page. Of course, the intent was to suggest a battery that might be available locally here, and store stock is often not the same as the online catalog... it might be worth checking (in person).
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Old 08-18-2014, 03:20 PM   #58
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If the first one you disconnect is the positive side, and you touch it with a wrench, there is a risk of touching a grounded point with the other end of the wrench and getting a big spark due to the resulting short circuit.
Ha-ha, that's the best case scenario, wrench welds its' self to metal object or blows a hole in adjacent sheet metal, scares the crap out of you. Yeah, really good reason why the negative gets disconnected first.

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Old 08-18-2014, 03:25 PM   #59
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Ha-ha, that's the best case scenario, wrench welds its' self to metal object or blows a hole in adjacent sheet metal, scares the crap out of you. Yeah, really good reason why the negative gets disconnected first.

Ron
I'm not about to prove anybody wrong so I just disconnected the negative first ( and the trailer was off shore power. When I reconnected, negative first ), there was a small spark at the terminal.
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Old 08-18-2014, 03:27 PM   #60
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I'm not about to prove anybody wrong so I just disconnected the negative first ( and the trailer was off shore power. When I reconnected, negative first ), there was a small spark at the terminal.
You got a spark at the negative terminal when you connected it with the positive disconnected?
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