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Vanner??
My friend George has a 98 Royale we have a 97, Anyways he called me the other day and said the red generator or alternator light came on on the dash, 1st thing thing I ask if the belt is on, On the Royales with out OTR they added a 24v charger for chassis batteries and the big charger 375amp is for 12v house batteries. So he said the chassis was around 28v and charging,why is the light on?? I have not dug into mine yet but to my understanding the 24v charger goes through the large Vanner Equalizer so if the 24v side is 28v the 12v side should be 24v half as much, Then there is the Vanner controller small box 5×5 or so that works the lights and controls the EQ??. Now George said he replaced the small Vanner controller last year. George said he talked to Gill Johnson and he said it could be a relay or a bad wire ??? Any thoughts??
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11 Replies
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Your 4 24v chassis batteries are setup in series-parallel to create 2 banks of 12v. The Vanner equalize each side as some of the coach electric system uses either leg of the 12v. On top of this big heavy Vanner piece there’s another Vanner monitor device (mines an em70d) which sets a light for high/low and balance.
On my coach I have an alt signal wire for my 24v chassis alt. If it’s not working there’s an a light on the dash.
2000 Featherlite H3-45
2024 Jeep Grand Cherokee
Leesburg, FL -
If your alt light is on check to make sure it’s sensor wire is tightly connected on the alt. Mines on the side and pretty easy to just fall off.
I have a ttlt device that turns on a red square on the dash and has a switch to change from alt1 to alt2. No clue what that does
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If an issue is related to the equalizer the dash warning light has usually been blue.
However rather than question any warning light related to the electrical systems just get the multi-tester and read voltages as previously described.
Newer coaches use a proprietary device to display warning lights but I do not think the late nineties vintage coaches use them so at least that is one less thing to check.
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Hey Jon! I looked at mine yesterday I’m sure it’s close to Georges 98 and from Vanner EQ there is a small cable that goes from Vanner controller small box to Vanner EQ to the 3 lugs at bottom and on controller says lights must control dash lights maybe a wire is loose?
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Could be Art. Often the ground is the faulty connection.
I cannot offer any more than a guess because all converters did things their way, such as my 97 Liberty had a 24 volt house with minimum of 12V loads and no warning lights for the house, but gauges that could be read.
When in doubt however I measured voltages at the bottom of the Vanner equalizer, engine running and engine off. On the chassis Prevost installed a monitor above the chassis batteries and most often if I got a warning light it was because the monitor had failed, so I disconnected the power to the dash light until I got a new monitor.
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Jon looking at Vanner monitor the 3 wires that go to the lamps have specs,Battery Ballance Input voltage divided x2 plus or minus 6 percent and systems High 30.3v and low 23.7v is vanner monitor sending that power to lights or the other way??
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That is the monitor for the chassis and just to be sure there is no issue with continuity I check its input at the base of the equalizer and then at the monitor.
If the voltages are within range and I have a dash light the monitor is bad.
I disconnect the output so I do not have the warning light to stare at.
Those monitors had a tendency to catch fire but later versions were OK.
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I should have added the D model was the latest and it was not a fire issue.
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That is a EM70D is that a safer D model??
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The burned wiring was with the original A model and to be safe, regardless of which model was installed owners were asked to fuse the wiring to and from the monitor.
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My early model (probably 1998 or 1999 vintage) Vanner Monitor “burned down”. It melted itself, melted the wiring and air lines above it. I replaced it with a D model like that pictured. I looked in the last month and couldn’t find a model newer than D.
I’m critical of the Vanner company for NOT integrating fuses in the monitor and NOT putting lights on the monitor so we know what it’s telling the dash 40′ away. My polite letter to Vanner management outlining a wonderful upgrade (which would send just about every Prevost owner running for the upgrade) went unanswered.
I gave my burned down monitor to Jeff Rowe at East Tennessee Luxury Coach. He might still have it there so you can see what it looked like.
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