Clr4ils Posted Friday at 09:23 PM Report Posted Friday at 09:23 PM Spent today trying to troubleshoot something and came up with a dead end…. have an 89 m201se. The panel lights don’t work, so I had hoped it was just the super expensive fuse burned out. Nope. That’s fine. Glareshield lights work along with the flaps/trim lights. I pulled the rheostat box out and tested all the resistors, rheostats, main breaker, etc and I can’t find anything. It was in the shop in 2024 for a new xpdr and I assume that it’s as simple as just a missing ground wire or something disconnected. Main wire connection is plugged in from the controls knobs since it’s all the same thing for the glareshield lights. anywhere else I need to check? It’s all of them not just a couple. Thanks in advance for any tips.
PT20J Posted Saturday at 03:15 PM Report Posted Saturday at 03:15 PM Later models have a light controller in the tail cone. I’m not sure what year Mooney started doing that. I’d just get the schematic for your serial number and start tracing connections with a DVM.
Clr4ils Posted Tuesday at 06:23 PM Author Report Posted Tuesday at 06:23 PM On 11/8/2025 at 10:15 AM, PT20J said: Later models have a light controller in the tail cone. I’m not sure what year Mooney started doing that. I’d just get the schematic for your serial number and start tracing connections with a DVM. So beyond the battery access area? In the rudder? Interesting. I’ll have to look it up.
PT20J Posted Tuesday at 07:58 PM Report Posted Tuesday at 07:58 PM 1 hour ago, Clr4ils said: So beyond the battery access area? In the rudder? Interesting. I’ll have to look it up. It’s at the bulkhead between the baggage compartment and the tailcone in the tail.
Clr4ils Posted Tuesday at 08:08 PM Author Report Posted Tuesday at 08:08 PM 8 minutes ago, PT20J said: It’s at the bulkhead between the baggage compartment and the tailcone in the tail. I’ll have to check there but I also found in the service manual it describe a transistors that are on the back of the lighting control box. That matches what’s in my plane. Would there be another set of transistors in the tail as well or if it has those two on the control box that would be the only ones. So hopefully it’s that the transistor is bad because apparently you can replace that.
PT20J Posted Tuesday at 09:07 PM Report Posted Tuesday at 09:07 PM 57 minutes ago, Clr4ils said: I’ll have to check there but I also found in the service manual it describe a transistors that are on the back of the lighting control box. That matches what’s in my plane. Would there be another set of transistors in the tail as well or if it has those two on the control box that would be the only ones. So hopefully it’s that the transistor is bad because apparently you can replace that. It depends on the serial number. You’ll have to check the schematic for yours. But, if you have transistors at the instrument panel, I don’t think you will have a controller in the tail.
Recommended Posts