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In my case, because the minimum order from DigiKey is 25, so you'll have extras!

My diode stopped diode-ing, CR1 measured 1.8 ohms both directions. Replaced CR1 and CR2 with new doubled-up diodes and lights/pump are steady as a rock now. Ready for the next hurricane, thanks guys! -- Carl

Jumping MT-4 makes no difference. @Guyfang I hear you about vibration, but it happens without the engine running, just the fuel pump running, and on the other hand can go for long periods of time with the engine running without a problem it doesn't seem to add up. I'm going to replace the...

I found that batteries in my meter were dead, so ignore previous reading. I got 0.2 ohms between gauges, 0.2 ohms gauge to panel ground, and 1.2 ohms panel ground to main engine ground. The problem is intermittent so it might be in that path but we're just not seeing it at the moment. Will...

Thanks @nextalcupfan for all the measurements, you make a good point. Will try to fit in some generator quality time tomorrow evening and get back with results.

I've got odds and ends, tell me what you have in mind.

Thanks Kurt, If it was a snake it would have bit me! 🙂 Here's a pic. So, disconnect battery, take this thing apart and clean it?

Okay, tried unplugging the pump. No variation in the lights with the pump unplugged and the switch in the prime and run position, engine not running. I repeated the test with the aux pump running, but not the engine, and it behaves the same way as when the main pump is in the circuit. That is...

Go from the ground screw on one gauge to the ground screw on another. That way you can do it all from the front panel without trying to be in two places at once.

Good suggestion, will try.

Thanks for that. I'm getting 1.4 ohms between any pair of ground screws on the back of the oil pressure, temperature, and fuel level gauges.

Try video now?

Interesting that it happens without running, that eliminates the whole charging side doesn't it? Not sure if the pump is the cause or just another effect. Not sure what the deal is with the video, will investigate.

I haven't had time to do much with my system but it has been sitting on the driveway so when I have a few minutes in the evening I go mess with it to see if I can identify a pattern to the flickering. I found that the flickering seems to connected to a change in the sound of the fuel pump. In...

I appreciate the coaching, you guys are great! CR1 looks okay visually, I tugged on it some with no change in behavior. This is an intermittent issue though, took me half an hour to catch the clip above, so that complicates the verification process. I have a 24V test lamp with alligator clips...

Sorry, should have mentioned that prior to 1:20 I was toggling the panel lights. Figured I would exercise the switch a bunch to see if it would make something happen.

Okay, back to this problem with more data, I caught it on video! Watch from 1:20 to 1:50 keeping an eye on the temperature gauge. It drifts down slowly, then pops back to normal when the lights do, fuel gauge does the same thing. So it's something that affects both lights and gauges. Suggestions?

I measured 2 ohms from negative battery terminal to ground on one of the lights, and 4 ohms from the positive side the the light. That doesn't seem bad, but then again I'm not sure what the good range should be. Pro tip: if you ever find yourself in a tight spot and need an arc welder, a 1/2"...

Thanks for the input guys, I will be running it again this weekend and try your ideas. I plan to look at the panel light voltage with a scope and see what it looks like. That's assuming I can get it to happen...

The mystery continues, checked the lights this evening and they were steady as a rock! System has been running continuously since I observed the problem. I hate intermittent problems. I checked the voltages again, virtually identical to before. Shut it down and let things settle for half an...