I've been thinking about the same project but I'm not sure it would work. Here's why: The ETACS module controls the dome light from a signal from the door switches. The output from the ETACS, probably a transistor, is sized for the dome light bulb by itself and would likely be over loaded if the map lights were added to it, even through two diodes for isolation. I don't know about y'all, but I don't want to damage the ETACS if I can avoid it.

There might be another idea, though. There is a blank oblong panel on my overhead console just aft of the sunglass holder door. I don't know why it's there, unless it's the location for controls for a sunroof on the cars that have one. I'm thinking about getting a couple of LED's, putting them in some holes in this blank panel, and wiring them to the dome light switch. If the holes are drilled at the right angles, they will shine in the driver's and passenger's laps. Since LED's pull much less current than incandescent bulbs, the likelihood of pulling too much current through the dome light control circuit would be much less.

And another idea is to get some small bulbs and wire them in parallel with the wires to the red marker lights at the lower corner of the door trim panels, the purpose being to illuminate the footwells when the front doors are opened. Since they are operated by the switches directly, pulling more current through another bulb wouldn't be such an issue. These "courtesy lights," as they were known, were once very popular. Even my 1973 AMC Hornet had 'em.

Opinions, anyone?