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Old 09-19-2021, 06:20 AM   #1
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Wiring diagram for auxiliary start

I need a wiring diagram 2002 National Dolphin #6355 dash board auxiliary start. Mine doesn't work and I hope I never have the need to use it. The button is there and wires are hooked up but where does it go from there.? I'm also missing the solenoid or what ever to charge the coach batteries when the engine is running. I have been reading up on this and it seems you can put a lot of money into this. What does everyone else use? Our coach, it appears, was a flood damage unit but I cant find any history on it being in a flood. A 2002 36' Dolphin with now 4100 miles. Two years ago when we bought it, it had 2985 miles. It has the 8.1 engine. I just got it back from a repair shop and $7800 later, it has a new fuel tank, another story, brakes, some rewiring done and all the fluids changed. Even a new filter on the power steering. It runs great but seems to be running rich from the smell of the exhaust. Parts had been removed prior but I think were ready for our first big trip now that the gas is $3.10 a gal. I highly recommend the Boys Club in Cherokee, North Carolina for any service work. A large facility as they work on heavy trucks. They have two full time certified mechanics to work with kids trying to learn a trade. I'm all for this.
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Old 09-19-2021, 07:47 AM   #2
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The boost button controls a solenoid wired between the positive cables of the house and chassis batteries, just like using the red jumper cable.

That same solenoid also closes with the ignition key on, or oil pressure on some models, or with a voltage sensing device on newer models.

When that solenoid closes, the charging chassis battery sends some charge to the house batteries.

If nothing is there, you need a continues duty solenoid rated for 150 to 200 amps and some cable between the batteries. Then a way to send 12 volts to the small terminal to close it.

A good option is a BIM 160 or 225. Same large cables needed but automaticly shares the charge either way.
Google it.
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Old 09-19-2021, 08:08 AM   #3
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This diagram ( pdf ) probably isn't as complete as what you need , but could be a starting point .
Interconnect solenoid , is the part your missing.
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File Type: pdf National RV wiring.pdf (566.0 KB, 15 views)
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Old 09-19-2021, 10:56 PM   #4
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At this link you can download more information for your Battery Control Center (BCC). You can also call RV Custom Products for help.
When you replace the interconnect solenoid make sure you get a constant duty one. A regular starter solenoid will burn out almost immediately.
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Old 10-05-2021, 03:24 PM   #5
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The wiring diagram tells you what you need to know. It is the closest solenoid to you on the back board in the BCC. You can have someone engage the button on the dash for start assist and listen for the solenoid to kick in. I had to buy a new board for my 2003 Dolphin and saw the solenoids for about $85.

Now for the hard part. To get access to the connections you will probably have to remove the outer board and maybe the inverter. Make sure to label all of the connectors.
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wiring, wiring diagram

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