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07-25-2017, 11:42 AM
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#1
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Senior Member
Join Date: Feb 2005
Location: Chesapeake, Va.
Posts: 282
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02 Adventure, I have no 12 v to the MH, until I add shore power.
Now a NEW problem, I have NO 12 volts in the camper...unless the coach
is plugged in to 120 volts, or on Gen. power
Got a clue, as I do NOT hear the relay activate when I plug and unplug
the power cable into 120 volt line. What relay have a heard for 15 yrs?
On further trouble shooting, the Auto transfer sw. is working
as prescribed. After starting the Gen. while MH is plugged into
shore power, I can load and unload the Gen. and the RPM/pitch
will change.
So I have to surmise that the relay is stuck in whatever condition
I usual hear when I plug into shore power.
AS I HEAR NOTHING WHEN I PLUG AND UNPLUG TO SHORE POWER!
The sw. by the door (batt. disconnect relay) appears to be switching
power, and batt. mode switch I can activate it by jumping power
to coil.
I assume (batt. mode switch) is the one activated on the dash!
Is there more relays that come into play?
Any help would be greatly appreciated.....coopcolt
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07-25-2017, 12:10 PM
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#2
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Senior Member
Gulf Streamers Club
Join Date: Jan 2012
Location: Cincinnati
Posts: 19,925
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If you have 12v when on shore power, that indicates your automatic transfer switch(ATS) is allowing 120v through to your converter/charger, the source of 12v power when plugged in. The fact that you also have 12v power when the generator is on (while shore cord is disconnected) shows the ATS is working. The usual default position of the ATS is to connect the shore cord. Never plug in the shore cord or start the generator with a load (A/C, WH electric element, etc.) already on, it can cause arcing of the ATS switch points.
The lack of 12v with no 120v shows your house batteries aren't connecting. It could be dirty connections at the batteries or ground, a bad battery disconnect relay, a blown fuse or circuit breaker.
With a voltmeter, check the voltage at the battery terminals. Then move to the battery disconnect relay. The two large terminals should both show the same voltage tested to a ground. If one terminal shows no voltage, then the relay isn't closing. If both terminals show no voltage, that indicates a bad connection or open circuit breaker or fuse in the (+) line from batteries to the bat. disconnect relay.
I don't understand your, "battery mode switch" on the dashboard. Often you'll have a "Boost switch" that can connect House and Chassis batteries together for extra power when starting the engine or generator, it's a spring loaded switch that must be held on when starting the engine. The boost switch manually connects a relay that is also triggered when a charging voltage is detected in either battery group to connect and charge all batteries. Another switch on many dashboards allows you to switch the source of power for the dash radio. One setting supplies power from the ignition, (Chassis) the other position powers radio from the House batteries to use the radio while parked without needing ignition set on 'accessory.'
__________________
Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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07-26-2017, 04:39 AM
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#3
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Senior Member
Join Date: Jul 2014
Location: Alabaster, AL
Posts: 235
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I once had a similar problem ( different Brand MH) and it turned out that a circuit breaker between the batteries and the charger had popped. My symptoms we're similar. While on shore power everything worked as expected but the house batteries were not being charged. When I disconnected shore power there was no 12v. The switch by the door that activated the relay to switch from shore power to house batteries was working as expected but since the batteries weren't being charged there was no 12v when I switched to house batteries. While tracing the circuit I found what looked like a row of terminal strip connectors was actually a row of resettable circuits breakers. I pushed in the little reset button on the circuit breaker for the battery charging circuit and that fixed the problem. So make sure 12v from the charger is actually getting to the batteries when you are on shore power.
__________________
Jerry & Susie
2006 Itasca Horizon 40KD
2014 Honda CRV AWD
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07-26-2017, 06:35 AM
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#4
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Senior Member
Join Date: Feb 2005
Location: Chesapeake, Va.
Posts: 282
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KD4XR, That sounds like what I got. I have a good door sw.
and a good relay disconnect, as it is switching the 12v off and on.
I opened up the charger under the oven, checked the 2 --30amp
fuses, both good. But there was now 12 volts on a large BLACK
wire coming to the charger.
So 12 v left on a red wire and went to the charger on a black wire.
Tell me that somewhere switched/fused and changes red to black.
I only know 2 sets of reset fuses, on the step and above the frig.
Is that the kind of fuses you speak of ????
Thanks for the input, now a new/fresh start TODAY!
COOPCOLT
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07-26-2017, 12:43 PM
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#5
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Senior Member
Workhorse Chassis Owner
Join Date: Aug 2007
Location: Coarsegold, CA
Posts: 917
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Quote:
Originally Posted by coopcolt
I only know 2 sets of reset fuses, on the step and above the frig.
Is that the kind of fuses you speak of ????
COOPCOLT
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When you say "on the step', I can think of two ways to take this.
1.) the AC circuit breakers to the left by the step
2.) the DC breakers behind the second step. there is a 55 amp breaker back there that could be your problem.
There isn't that much stuff between the batteries and the converter. You have, of course, checked the battery.
Starting from the battery, you should be able to trace the 12 up to the converter. Everything is behind the step.
__________________
2001 Winnebago Adventurer, 35U, W-20 8.1
F+R Trac bars, F+R sway bars, SafTsteer, F Sumo Springs, 4 Koni FSDs
2007 Forest River Lexington Ford E450 Chassis
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07-26-2017, 01:45 PM
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#6
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Senior Member
Join Date: Feb 2005
Location: Chesapeake, Va.
Posts: 282
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Thanks for ALL the help!
I did today find my problem, coming off the 55 amp. CB behind
the steps. Traced it thru the CB and into a LARGE BLUE CONNECTOR,
when I pushed back the chafing cove I could see 1 large copper wire
that was NOT seated in one side of the blue plug. The blue plug is
ganged together with another blue plug, wire is so thick making one
wire too LONG and one too SHORT.
This short wire was most likely never locked into the plug.
I may go back and cut the long wire, so as to allow the short
wire more easily lock into the blue plug.
Thanks for all the help! tenn.vol.
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