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Old 09-11-2012, 08:58 PM   #15
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Radarman when I turn off the MH the display goes out after a few seconds. I really did not know it continued to drain the batteries. How did you find this info? And after a small first trip I really enjoy this tool very much!
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Old 09-12-2012, 07:14 AM   #16
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Just installed mine and am on our first trip. Easy to find the connection after removing the drivers left foot cover that covers the surround sound.
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Old 09-12-2012, 10:57 AM   #17
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Quote:
Originally Posted by conmoto View Post
Radarman when I turn off the MH the display goes out after a few seconds. I really did not know it continued to drain the batteries. How did you find this info? And after a small first trip I really enjoy this tool very much!
The power draw on the batteries is very small but over time without a charge being applied to the batteries they will go down.
As I stated earlier you can do a mod so pin C gets the power from the
key being turned on, it has to fused with a low amp fuse 1/2 amp should
do it.
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Old 09-12-2012, 11:06 AM   #18
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Just like wb7auk says, after time it will drain your chassis batteries. This is even after the display blanks out. Found this out by monitoring chassis batteries voltage over time while experimenting with it. No big problem--I just disconnect it at the display (I use side input connector) if parked without shore power. Have been on the road now for 2 weeks now, works great. Nice to monitor average MPG too--8.5 to 10 MPG depending on road.
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Old 09-12-2012, 12:06 PM   #19
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Before anyone makes a mistake I should mention power input on a 6 pin plug is pin
C however on a 9 pin plug the power input is on pin B.
Sorry for my oversight.
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Old 09-14-2012, 08:05 AM   #20
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Follow up:
Ron from Linear Logic (the person who designed Scan gauge D, also a ham) called and we had a long talk.
First off he will get someone on the pin connection issue I pointed out.
Second he says the power draw is 300 ma or less and should not effect a battery
that is in good shape.
He said that some motor homes his included the builder has provided power to the
plug off the key while others depend on the ECM battery line for power.
So it is ok to change the power to the pin supplying power just be careful that you
do it right.
Also the voltage you see posted at the gauge is the voltage seen at it's input and this
might be lower than seen at the ECM some 35 feet away if the power is taken from
that point.
As too readings jumping all over he said that could be several causes, bad connections, bad cable, and on the newer coaches which use a higher data speed
that require a load resistor may not have one or it is the wrong value.
He will get that information to me to post.
Hope this helps some of you.
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Old 09-14-2012, 11:50 AM   #21
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On our coach, the 12v feed to the ScanGaugeD is connected to the ignition key. When the ignition key is off, the ScanGuageD is also off. Ours uses the nine pin connector. I think that is also true for any ODBC II connections I have run across. Have y'all confirmed a voltage drain, or are you just seeing the initial "bleed" off from the ScanGaugeD when you turn off the ignition switch?
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