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Old 06-12-2014, 03:34 PM   #1
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Extra lead to Dolphin engine battery pos. terminal?

I replaced the chassis starting battery on my '05 Dolphin under duress (bad weather and limited time and space). I hooked up two heavy-gauge cables with red insulated connectors to the positive terminal--actually the almost-long-enough side terminal bolt (but that's another issue).

So after a few weeks, I'm looking under the coach and see this wire lead (about 12 ga I guess) with a red battery connector hanging down behind the battery compartment. It comes out of a wire harness that runs along the right frame rail. Judging from the color, connector size, and position, it sure looks like it came out of the hole just behind the chassis battery positive terminal that the others do. If it was connected to the battery when I removed it before, I didn't notice. But if I try to put it on with the two main connectors, the thread portion of the terminal bolt isn't long enough to get started into the battery. It's barely long enough as is.

Can anyone confirm that they have two heavy and one lighter gauge wires connected together at the pos. terminal? Any idea what the lighter one is for? I looked at the Dolphin and Workhorse schematics, but no help.
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Old 06-12-2014, 05:21 PM   #2
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"Any idea what the lighter one is for?"

Maybe a diode battery isolator! Are both your chassis and coach batteries charging?
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Old 06-12-2014, 06:28 PM   #3
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Sorry, don't know.

Mine has only two heavy red cables at the pos. terminal.

One heavy black cable and a lighter weight black cable at the neg. terminal.

The two #2 reds:
a) feed starter solenoid.
b) feed to one side of isolation relay on the BCC...
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Old 06-12-2014, 07:33 PM   #4
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Standard connections are

1: (Heavy) Vehicle power
1: (Heavy) House connector (more on this in a bit)
1: (light) Steps

The house connector runs to the isolator relay/box, it is used to charge the house batteries as you drive **AND** to "Boost" the chassis battery (Jump start using house system from dash) when necessary and thus MUST be a heavy wire. It may also charge the chassis battery when parked and plugged in.
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Old 06-18-2014, 07:26 AM   #5
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I hooked the light gauge terminal to the positive terminal and no sparks, so far, so good. It might have something to do with charging. I did notice the chassis battery would be a few tenths volt under the house batteries where before, they were usually about the same when sitting.
It was quite hard to get all three terminals hooked up under one bolt. The original side bolt wasn't long enough, so I used a 3/8 x 3/4" bolt with a couple of washers and even that was difficult to get the threads engaged.
Thanks for the responses.
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Old 06-19-2014, 10:17 AM   #6
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It may be the battery temp lead for your inverter? The inverter shuts down if it indicates overtemp.
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