DonMuncy

Only in aviation would "only" and "$7000" appear in the same sentence.

First thing I would do is swap the 1 and 3 CHT probes and fly it to see if perhaps the # 1 might now show the high temp. Thus a bad probe. I had it happen on my K model.

Absolutely amazing. I wonder how often one of those robots go out of adjustment, and have to be tweaked.

It is not hard to do a capacity check on the battery (OK, you do have to have the equipment). If it checks out good, no worries. If not, replace it.

I think the thought process is that one often needs a light to unload the plane after a flight. Not a bad thought, but it has cost many batteries. The shut-down timer is an easy fix.

Bear in mind that (at least in the modern planes), there are two senders, one at the inboard end and one outer end.

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With the cost of the timer and ease of installation, I consider this one of the "best bang for the buck" things you can do. I know that many people fly a lifetime without having the problem, but one battery is one two many.

It is not too much more than that. But some. Getting (or designing) a timer good for 30 seconds or so is easy. Getting one to stay on for 10 or 12 minutes is more of a challenge. Basically, the power feeds into a capacitator, and when the power is removed, it then bleeds back through a resistor. Sizing the capacitor, resistors, diodes and the transistors to get the timing right is the problem. Thus the Darlington pair transistor set-up. And yes, it requires a relay to carry the power for the lamps.

Good luck

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After I ruined my battery leaving the cabin light on, I designed a circuit to keep the lights on for 10 or 12 minutes after the master switch is turned off. It is an electronic circuit with a darlington pair transistor set up. I have a couple of them made up. Naturally, they are not STCed, so would need to be installed as a minor modification by and A&P, or a reasonably talented hangar elf. Let me know if you want one, or I will be glad to give you the diagram so you could build your own.

The only one I am aware of is the one I make.

Are you happy with the result? Do they fit flush with the cowl like the originals did? Is there any downside, other than cost?

Thanks guys