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Old 11-06-2006, 05:18 PM   #1
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1990 25' Airstream 250
Altoona , Georgia
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monitor board

The darn thing just quit - nothing works on the board - still has power to it -
any sugestions?
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Old 11-06-2006, 05:28 PM   #2
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Quote:
Originally Posted by David Alan
The darn thing just quit - nothing works on the board - still has power to it -
any sugestions?
Fuse on board, open cap, broken trace, bad ground. Start poking around.

Jim
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Old 11-06-2006, 07:55 PM   #3
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Quote:
Originally Posted by Jim Clark
Fuse on board, open cap, broken trace, bad ground. Start poking around.

Jim
What he said. These things are notorious for bad grounds. Hook a test light up to a good ground, and touch the other end to the ground lug on the panel. If the light lights, you have a bad ground.
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Old 11-08-2006, 06:47 AM   #4
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Quote:
Originally Posted by overlander63
What he said. These things are notorious for bad grounds. Hook a test light up to a good ground, and touch the other end to the ground lug on the panel. If the light lights, you have a bad ground.
Hi Overlander63; The most effective and least time consuming troubleshooting of open circuits in DC is as you said, is use a test light.
However, there can be a hitch in some instances. Test light does not require much amperage to indicate a closed circuit, but in places as the distribution panel where amperage demand is high, partial open can drive you to having too many beers. The best way is as you said, check for continuity.
To check for open negative circuit place the test light clip on the positive battery terminal, and test each negative terminal. To check the positive wires reverse the process. This will identify the polarity of the tested wire, as well as any open circuits. The hitch may occur in case of corroded or weak connection where required amperage delivery across that connection is insufficient. The weak connection may provide enough amperage to light the test light, but you still may have a problem with high demand circuits. This is why it is easier to ensure that all connections on power supply side are solid and clean, on the battery and the distribution panel. Most of the time it is dirty or corroded terminals, rather than broken wire inside the skins that is a problem. That is the most prevalent scenario in the marine application. If the terminals are good and clean, only then we need to break out Ohmmeter to check the Resistance in the wire. Load tests on wires usually result in fire especially in unprotected circuits.
Problems in high amperage demand circuits lays most of times in bad connections. Thanks, "Boatdoc"
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Old 11-08-2006, 07:04 AM   #5
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it sounds like the ground might be the problem good luck -----hendrie 42
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Old 07-03-2007, 09:01 AM   #6
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1989 25' Excella
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Quote:
Originally Posted by boatdoc
Hi Overlander63; The most effective and least time consuming troubleshooting of open circuits in DC is as you said, is use a test light.
However, there can be a hitch in some instances. Test light does not require much amperage to indicate a closed circuit, but in places as the distribution panel where amperage demand is high, partial open can drive you to having too many beers. The best way is as you said, check for continuity.
To check for open negative circuit place the test light clip on the positive battery terminal, and test each negative terminal. To check the positive wires reverse the process. This will identify the polarity of the tested wire, as well as any open circuits. The hitch may occur in case of corroded or weak connection where required amperage delivery across that connection is insufficient. The weak connection may provide enough amperage to light the test light, but you still may have a problem with high demand circuits. This is why it is easier to ensure that all connections on power supply side are solid and clean, on the battery and the distribution panel. Most of the time it is dirty or corroded terminals, rather than broken wire inside the skins that is a problem. That is the most prevalent scenario in the marine application. If the terminals are good and clean, only then we need to break out Ohmmeter to check the Resistance in the wire. Load tests on wires usually result in fire especially in unprotected circuits.
Problems in high amperage demand circuits lays most of times in bad connections. Thanks, "Boatdoc"
Hi boatdoc, here is my scenario; resistance on tank wires-but fresh-grey-black all read "E".
But the battery indicator is working fine...

Tank gauges quite working about 1 month ago.
Does this mean the board is toast?
Where to find replacement for 89 vintage system?

Thanx, Bill
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