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Re: Chassis DC Fuse Panel Question

Unread postby RobC on Wed Feb 25, 2015 7:29 pm

Oh and I know my inverter works (as well as the AC system)
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Re: Chassis DC Fuse Panel Question

Unread postby badbillybiker on Wed Feb 25, 2015 9:09 pm

I ul'd a number of manuals etc. Do a search for triad or converter..... They are in the PDF format...HTH...
There are others, just keep searching with different wordings...
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Re: Chassis DC Fuse Panel Question

Unread postby 77Travco on Thu Feb 26, 2015 3:07 pm

Just an FYI...
My alternator charges both my engine and house batt's through an isolator. The alternator feeds to the isolator and then that splits to each battery. The isolator acts as a diode to prevent a backfeed to the alternator from the house charger.
These electrical 12 volt isolators are pretty easy to find if you wish to wire one back in. (came from the factory this way) Hope that helps!
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Re: Chassis DC Fuse Panel Question

Unread postby RobC on Sat Mar 14, 2015 12:49 am

OK so I got my house dc vs chassis DC system figured out (basic plumbing principles applied). My systems are separate, got. Battery isolated and my system is charging like it is supposed to.

I have now graduated from a Sh#tty electrician to a marginally skilled electrician.

I am now shouting obscenities on a regular basis while lying upside down under the dash basically rewiring the whole chassis dc fuse panel making sure stuff works.

Noob question: What is the difference between BATT ACC and IGN ACC on the DC chassis panel?

I assume BATT accessories are wired directly to the battery with no need for turning the ignition switch? And IGN ACC means those accessories need the alternator to be running?

Both of these have a short wire that goes to two bolt type lugs adjacent to the flasher pots. Which I assume is provided for multiple and easy access to connect additional accessories (Step, air horn, rockin stereo, etc.).

Thanks in advance

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Re: Chassis DC Fuse Panel Question

Unread postby Dave78Chieftain on Sat Mar 14, 2015 8:16 am

I assume BATT accessories are wired directly to the battery with no need for turning the ignition switch? And IGN ACC means those accessories need the alternator to be running? I assume BATT accessories are wired directly to the battery with no need for turning the ignition switch? And IGN ACC means those accessories need the alternator to be running?


BATT ACC Fuse - Source directly from battery via circuit A20. Used for things that would need power when IGN switch is OFF.

IGN ACC Fuse - Source directly from Ignition Switch via circuit J2. Used for things that would need power when IGN switch is ON or at ACC.

Both were provided by Dodge for end user use however neither one was used by Dodge. Used by RV manufacture or RV owner.

You are using the Dodge chassis wiring diagrams? I have them posted on my web site if you need them: http://dave78chieftain.com/ (use the pdf link on the associated pages)

Notes:
When Dodge changed over to the RM300 (M300), RM350 (M400), and RM400 (M400) chassis in 73-74 with the new style instrument cluster, they also changed to the newer style chassis fuse panel. It is mounted to the steering column under the dash. Presence relay and horn relay are also under there.

Presence relay was used to reduce the current flow through the headlight switch.

Check the white semi-circular electrical plug at the base of the steering wheel for the ignition switch cable. Known weak spot for corroded connections.

When Dodge changed over to the RM300 (M300), RM350 (M400), and RM400 (M400) chassis in 73-74 with the new style instrument cluster, they used a short section of wire on the alternator B+ circuit as the shunt for the dash Amp meter input. This was the fix for the Amp meter "weak spot" design across all Dodge products that resulted a dead chassis when the shunt in the old style Amp meter burnt out.

Because a fusible wire section uses smaller gauge wire than the rest of the circuit, they break down over time. Make sure the ones down at the starter relay on frame rail are not flimsy or the fire retardent insulation on them is not swollen from age. The wire section should be as stiff as regular wire.

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Re: Chassis DC Fuse Panel Question

Unread postby RobC on Sat Mar 14, 2015 10:25 am

Great thanks Dave. Good info. Mine is a 76 so it has the newer panel. I have ignition ACC power at the panel but no Bart power. Now that I know where it goes I can trouble shoot along the way. Starter relay looks good but I don't know how to identify the horn or presence relay

What do they look like?
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Re: Chassis DC Fuse Panel Question

Unread postby Dave78Chieftain on Sat Mar 14, 2015 2:40 pm

Horn relay (might be out by horns - also may have been added to support air horns)
With old style dash, Dodge P/N: 1791437, NAPA: HR112 - http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Horn-Relay/_/R-ECHHR112_0460606374
With new style dash (if used), Dodge P/N 3738109, NAPA HR126 - http://www.napaonline.com/Catalog/CatalogItemDetail.aspx/Horn-Relay/_/R-ECHHR126_0460606710

Presence Lamp Relay (under dash, left side of steering column)
With old style dash, Dodge P/N: 2906028 - http://nospartsdepot.com/2906336.html
With new style dash, Dodge P/N 3489950 - http://www.bradsnosmopar.com/nosmo19dotrh2.html
You can also substitute a standard generic 40 amp aux light relay. I replaced mine with a aux light kit with a switch. This allows me to use my clearance lights as a thank you blinker rather than using the actual headlight switch.

Use the Dodge MH Parts book to get Dodge P/N then search that number for NOS or cross ref to after market P/N.

but no Bart power


Bart power?

I am a Winnebago owner, not Travco

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Re: Chassis DC Fuse Panel Question

Unread postby badbillybiker on Sat Mar 14, 2015 3:04 pm

Yeh... a Travco owner who is lost like you too Dave.. .
What in the hexx is bart power?..
a first for me.. that meaning rather than driving, to take the Bay Area Rapid Transit??
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Re: Chassis DC Fuse Panel Question

Unread postby RobC on Sun Mar 15, 2015 1:05 pm

"batt" power........
Thanks for the relay info Dave. In got it figured out yesterday.

Rob
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Re: Chassis DC Fuse Panel Question

Unread postby badbillybiker on Sun Mar 15, 2015 2:15 pm

tnx... I now know that batt and not bart....is the correct word..
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