The other day i experienced a strange thing in my'91 240 wagon. After driving approximately 20-30 on the interstate, i lost most power to the accelerator. Not a complete loss but enough that i was quickly losing speed and immediately pour in my hazards and began to pull over. But ass I'm about to pull over, all power returns to normal. Simultaneous with this was a drastic loss of power to the headlights and instrument panel and all of my gauges went haywire, tach going from 0 to 3000 and back down without the engine sounding as though those rpm's were real, gas gauge going from full to half and back, speedometer going up to 80 then down to 40 then up to 60 with no actual speed changes remotely close to that.

My first suspicion was an overheating problem only because it was a hot day and I've had previous problems in 90°+ temps while in the highway. But it happened again on the return trip at night when it was much cooler. Maybe the overheating has gotten worse but I've never had that problem at night.

Second suspicion was obviously something between the battery, the alternator, or any of the connections between. But I've recently changed the alternator and it tests good. The battery tests good as well. There was a slightly loose connection on the alternator but it was so slight i doubt it was the problem. I have doubts about the accuracy if the battery testing as good, though. My other '93 240 was unable to hold a charge overnight but the battery tested good. Replacing or fixed the problem. Also my Harley was unable to hold a decent charge while the battery tested good. Replacing it also fixed the problem. But I'm not sure a bad battery would cause a loss in power or the instrument panel to go crazy, so I'm stumped.

I would appreciate any guidance. ThankYou