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I'll take a shot Posted by Ari [Email] ![]() ![]() In Reply to: Pictogram Update, T. Christopher, Sun, 19 Jan 2003 23:24:36 Members do not see ads below this line. - Help Keep This Site Online - Signup |
First, the pictogram doesn't measure resistance, it measures differences in current. Yes, for a given voltage, resistance is proportional to current, but it measures current, nevertheless.
The pictogram lights up if the current between the two legs is different by some (small) amount. As you've found, that current flow can be pretty complex. First off, the additional load of the running lights can only make things more difficult - namely, the fewer circuits, the less that can go wrong.
I think there are two possible explainations here-
First, the bulbs aren't balanced with everything plugged in. By removing one bulb, that compensates for whatever imbalances there are - it could be due to bulb differences, dirty contacts, and yet more sneak current paths.
Second, (and I particularly like this one), the Pictogram relay could be bad. It measures current flow, but how do you know it's measuring each leg properly? You could have a perfectly balanced system, and the pictogram relay is wrong. By removing a bulb, you're compensating for the incorrect pictogram. About the only way to easily check this one is to swap it out for a known good one.
Of course, you have a solution that works.
posted by 192.249....
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