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Old 02-20-2008, 08:43 PM   #15
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1991 34' Excella
Princeton , New Jersey
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If the brakes are 12x2 in. they will be OK. Not sure where you got the 5 amp draw on the magnets. Most magnets draw about 3.5 amps per when fully applied. You should never need full application as you will lock them up first.

A 30 amp circuit braker shoud be fine. However I would suggest you up size the wireing in the truck to #10 as the factory wiring is not sized for 6 brakes and you will see a voltage drop over the undersized wire.

Now all that said I am currently drawing 21 amps with 6 brakes and have No Brakes and not sure what the problem is just yet. But then again when something is broken all bets are off.
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Old 02-20-2008, 09:04 PM   #16
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1984 31' Limited
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The Brakes are 12" x 2" but I asked the salesperson what the amp draw was on the 7000lb. rated brakes and he quoted 5 amps as, according to him, the only difference between the 5600lb. rating and the 7000lb. rating is the size of the magnet. He claims that there is no difference in the linings at all. Only that it is a larger magnet. And, after looking at the schematic in my service manual, it doesn't appear to have any fuse whatsoever between the umbilical cord and the brakes. Thanks for answering and I hope that you get your problem fixed soon.
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Old 02-20-2008, 11:27 PM   #17
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Can't add much except that the magnets have different Dexter part numbers. The lighter duty magnets have white wire, and the heavier one are black wire.

Usually the overcurrent protection for the brakes is a breaker in the 12V power line going into the brake controller. Either on the firewall or under the dash of the tow vehicle.
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Old 02-22-2008, 05:18 PM   #18
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1984 31' Limited
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Brake Circuit Protection

In a follow-up to my own question of replacing my former 5200 lb. rated 12" x 2" electric brake assemblies with 7000 lb. rated electric brakes on my 1984 Airstream, I made telephone calls to the Airstream factory and to Dexter Manufacturing who makes the brake assemblies--both concurred that as long as I was replacing the "entire assemblies" and not just the shoes or the magnets, I will be able to upgrade the brakes to the 7000 lb. rating. However, you can not just upgrade the shoes or the magnet, you "must" upgrade the entire brake assembly. Special thanks to all who answered my questions regarding these issues.
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