Hmmm. Turns out that an 18V substitute opamp (like the TLC274) may not be high enough, without adding some capacitor filtering to the LED panel. Don't ask how I know.
Best stick with the original (36V) LM324.
You mention a white wire you found in the analysis process. In getting my sink pump (1980 Westy) working again after adding an independent second battery, I learned that, contrary to my assumption that the white which is packaged with the thick red is not a ground. Hooking that to ground when I hooked the red to pos made the pump not work. Reading other posts, I started the engine, which allowed the sink pump to run. I read on, then disconnected the white from ground and the pump worked without the engine running. This baffles me, probably because I don't have a wiring diagram to tell me what the white is going to.
Can anyone fill me in on this? If so, thanks!
...Tom in the Chocolatewagon
I have a 1984 Vanagon, has anybody had the fridge Led always on? Even if the fridge is off the light is on.