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Old 01-09-2004, 09:05 AM   #1
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misc. ee..lectrical problem....

norby is going nuts...see that...im speaking in 2nd person..i do have multiple personalities...i need a shrink...you see doc it all started when i bought this airstream....i used to wake up refreshed..ready to take on the day after having wonderful dreams about voluptuous women, and now i wake up thinking about airstreams...this morning i dreamed i was boondocking and i had used 50 ampere hrs of my house batteries..then i hooked up and drove off...now i have a factory towing package with and isolated 50 amp aux battery and i am wondering if that battery will top off my house batteries as i drive down the road...doc...PULLEEEEZ...you gotta help me....does my 160 amp alternator charge my battery and then the battery charge my house batteries?..i gotta know doc PULLEEEEZ!....
CRAZYNORB...
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Old 01-09-2004, 09:26 AM   #2
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Charging the trailer batteries, when towing, is automatic "IF" the tow vehicle is wired correctly.

Only you can answer that "IF".

Andy
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Old 01-09-2004, 09:31 AM   #3
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Norby,

If your truck came wired from the factory then the power is there on the 7 way connector.

The question that you have to answer is whether the charging wire is connected in the umbilical correctly. To test this unplug the umbilical from the trailer and with the truck running see what voltages you have. You should get a good 13+ volts on the feed from the truck. The way to know what pin it should be is to check the connector on the trailer while plugged in and charging with the univolt. There should be one pin with 12.5-13 volts there. The corresponding pin in the umbilical end is the charge line from the truck.
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Old 01-09-2004, 09:35 AM   #4
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And make sure the charge wire is heavy enough to actually charge. It is a long way from the alternator to the trailer battery, lots of voltage drop at 12v.

John
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Old 01-09-2004, 07:11 PM   #5
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Andy,
then what good is the aux battery?
Crazynorb
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The only true nobility is found through giving good food to your friends- Anton Careme

beauty is in the eye of the beerholder-cosmo fishhawk

if something is too good to be true, its usually gone before i get there-mister boffo
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Old 01-09-2004, 10:12 PM   #6
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You need to have the battery on board in case of a breakaway. The breakaway pin when pulled sends the 12 volts from the trailer battery to the trailer brakes. This is for safety reasons since when this pin is normally pulled the umbilical is no longer connected
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Old 01-10-2004, 06:55 AM   #7
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norby,

i assume the aux battery you are talking about is on your truck.

a second battery under the hood allows you to boondock leaving the trailer connected, with no worry about having a dead battery in the morning.

IF it is properly isolated when the key is off.

i can be done many ways, here is how i did mine.

http://www.airforums.com/forum...&threadid=3770

in cold weather layovers when you run the furnace you now have 3 batteries in parallel.

another fringe benefit of having a second one under the hood is that you always have a spare onboard.

if you kill your starting battery you could jumpstart yourself!

and yes, your truck will charge your house batteries when going down the road. dependant on the gauge of wire, perhaps slowly.

john
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Old 01-10-2004, 02:52 PM   #8
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more confusion

in studying my factory tow schematic....and no i havent started drinking yet...so i can follow lines....my aux batt is in series with my main batt....now..this means that i have either 18 or 24 volts(6 or 12v batt) going to the power dist block, which in turn branches off to my brake controller..batt charge relay...and multifunction switch....Santa Maria!...do i have a voltage drop that requires a "boost" battery? or does the brake controller need higher voltage and resistance is added to the rest of the circuits?...
Crazynorb
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Illegitimous noncarborundum(dont let the bastards wear you down)

The only true nobility is found through giving good food to your friends- Anton Careme

beauty is in the eye of the beerholder-cosmo fishhawk

if something is too good to be true, its usually gone before i get there-mister boffo
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Old 01-10-2004, 04:34 PM   #9
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what are you driving norby?

unless you have a ex-military vehicle with a 24volt system i doubt your batteries are in series.

john
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Old 01-10-2004, 04:37 PM   #10
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01' e-350 7.3 turbo
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Illegitimous noncarborundum(dont let the bastards wear you down)

The only true nobility is found through giving good food to your friends- Anton Careme

beauty is in the eye of the beerholder-cosmo fishhawk

if something is too good to be true, its usually gone before i get there-mister boffo
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Old 01-10-2004, 04:44 PM   #11
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ford

norby,

ford eh, can't help ya much there.

will have ask someone who has one to find out for sure.

road king moe, ya got yer ears on?

john
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