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post #1 of 8 (permalink) Old 07-07-2019, 10:48 AM Thread Starter
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Display voltage inaccurate??

Have any of you guys checked the voltage shown on the display against that shown on a separate meter?
I just found that my display appears to be showing approx. 2 volts higher on the display than what its actually showing to be charging with a meter. I got a "OVR" on the display today and its showing 16.5 - 16.7 volts on the display while running. My meter shows 14.3-14.5 volts running which is good. With engine off/key on the display shows 14.4 but the meter is showing me 12.75 volts which is also good.
I don't know if I'd ever really paid attention to the voltage on the display prior to having the "OVR" pop up lol?? I'm just wondering if its common for the readings to be off that much or if I have something else going on?
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post #2 of 8 (permalink) Old 07-07-2019, 11:52 AM
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There is typically a difference between meters, but it's fractional - being off by two volts indicates a problem with the on-board system and it's probably a defective display - defective in what it is reading, trust the off-board meter ahead of the on-board. It's kinda like the volt meter in cars and trucks - typically they only display a high and a low number and the indicator is somewhere in between. Both my F150 and Mercury Gran Marquis have similar gauges. The Merc seems to read low and the F150 high - With a multimeter, they both read about 14 volts at idle - the day my alternator failed and the battery went dead, you couldn't tell it by the gauge. Damn thing just died when the voltage got down below 10 volts. On the F150 it reads low 8 volts and high 16 volts - 12 would be 1/2 way between, so normal is just above 1/2 and the engine dies just below 1/2. Very helpful?

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Last edited by latebird; 07-07-2019 at 11:56 AM.
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post #3 of 8 (permalink) Old 07-07-2019, 01:09 PM Thread Starter
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Quote:
Originally Posted by latebird View Post
There is typically a difference between meters, but it's fractional - being off by two volts indicates a problem with the on-board system and it's probably a defective display - defective in what it is reading, trust the off-board meter ahead of the on-board. It's kinda like the volt meter in cars and trucks - typically they only display a high and a low number and the indicator is somewhere in between. Both my F150 and Mercury Gran Marquis have similar gauges. The Merc seems to read low and the F150 high - With a multimeter, they both read about 14 volts at idle - the day my alternator failed and the battery went dead, you couldn't tell it by the gauge. Damn thing just died when the voltage got down below 10 volts. On the F150 it reads low 8 volts and high 16 volts - 12 would be 1/2 way between, so normal is just above 1/2 and the engine dies just below 1/2. Very helpful?
Well, its a digital readout and its pretty consistent in the error amount. I was just curious if anyone else's 1000 is similarly inaccurate. The problem is, anything over 16.8 can cause other issues with the EPS cutting out and the display backlight going off according to the service manual. I haven't had any of those problems... Yet! Again, according to the manual, the VR on this machine cuts off at anything over 194 degrees until it cools to something like 174 and then kicks back on. I'd assume that's controlled by the ECM? I'm not sure if this just started since I can't really remember if I'd ever actually looked at the display voltage. I'm pretty certain I'd never had that warning pop up before though.
I was curious too if the problem is actually in the display or the ECM or the VR??
Wonder if a reflash might correct it?
Or if the VR may just be on its way out?
I'm gonna do some testing and check connections and things to see if additional resistance or a weak ground could somehow be causing the bad readings but I don't really see how it could.

If some of you other guys get a chance to check yours I'd sure appreciate it. That might help me track this down.
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post #4 of 8 (permalink) Old 07-08-2019, 02:44 PM Thread Starter
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Bump!
What kinda voltage you guys showing on your display? I wanna see if mine is totally abnormal with actual voltage of 14.5 but showing 16.5 on the display?
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post #5 of 8 (permalink) Old 07-19-2019, 07:57 AM Thread Starter
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Display voltage update!!

Ok guys, after extensive testing and lots of thought, I think I've figured out what happened to cause my "OVR" to pop up on the display and the display showing up to 16.8 volts at idle but measured voltage at the battery was 14.25!
The weather around here was consistently around 90+ with heavy downpours nearly every day right before this happened. On the two consecutive days before I got the overcharge message my machine had been on the trailer in the blazing sun for a couple or three hours and then got a heavy downpour on it. It was a day or two later in the garage that I noticed the overcharge message.
I went through the whole charging system testing and checking connections, wiring, etc. Everything checked out fine.
The more I thought about the circumstances just before the overcharge message came up I began to wonder if moisture condensation inside the display could be the cause??
Yesterday I removed the display to check it out. I laid it on a black metal piece by my garage door in direct sun. Within about 30 minutes you could see condensation forming inside the display case as shown in the first pic.
After about an hour and a half it had diminished to what you see in the second pic.
At around 2 hours + the condensation was about all gone so I plugged it into the harness and started the machine. On initial startup it showed 14.3 and rose to hover around 14.5-14.6 as shown in the third pic.
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post #6 of 8 (permalink) Old 07-19-2019, 08:35 AM Thread Starter
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Now for the follow up questions... latebird??
While tinkering with the display, I noticed a little round white sticker covering what felt like a hole in the back of the display. Thinking that maybe there might be an opening to allow the moisture inside to escape I removed the sticker. Under it I found a little rubber button looking thing that looks sorta like a reset button as found on some electrical components. You can see it in the attached picture EDIT: pic moved on upload "button" is on the right.
Anybody got a clue what it is?
I haven't tried it to see if it does anything yet lol. Thought I'd get some input first.

Second question... There is a row of tiny screws around the perimeter of the case. I thought about trying to take it apart and seal the case better.
Leave it alone?
Go for it?
What do you think?
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Last edited by polman500; 07-19-2019 at 08:37 AM.
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post #7 of 8 (permalink) Old 07-19-2019, 10:51 AM
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If you look closely at the rubber button, I believe you will find a split in the recessed portion - that will be the vent that allows the air pressure inside the instrument to equalize with the pressure outside the instrument - it is covered by a inspectors sticky to indicate the instrument passed QC - there may even be a calibration screw under it (I do not have one to check it against) - if you have the equipment to charge shocks or fill tires with nitrogen, you could flood the instrument with nitrogen at about 4 psi for about 10 seconds and put a new sticky on it. That would exclude moisture inside the device for awhile.

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post #8 of 8 (permalink) Old 07-19-2019, 01:11 PM Thread Starter
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Quote:
Originally Posted by latebird View Post
If you look closely at the rubber button, I believe you will find a split in the recessed portion - that will be the vent that allows the air pressure inside the instrument to equalize with the pressure outside the instrument - it is covered by a inspectors sticky to indicate the instrument passed QC - there may even be a calibration screw under it (I do not have one to check it against) - if you have the equipment to charge shocks or fill tires with nitrogen, you could flood the instrument with nitrogen at about 4 psi for about 10 seconds and put a new sticky on it. That would exclude moisture inside the device for awhile.
Thanks latebird, I'd sorta come to that conclusion this afternoon. Went ahead and removed the screws holding the face on it and let bake a while in the sun while opened up this time to expel any residual moisture. Put a little dielectric grease around the edge where it goes together during reassembly to maybe help seal better. I'll probably just leave it alone and see how it acts for now.
I have a tendency to get all OCD on little pestering things like that sometimes lol.
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