7.3 check engine light

[adavis11]

I have an early 99 7.3 with 120,000. I have had no problems with it so far. I was towing a trailer with a mower on it down the highway and after about 70 miles the service engine soon light came on for about five seconds, until I hit the brake to shut down the cruse and then the light shut off. I continued to drive another 85 miles and the light never came back on. When this happened it was during a very hard down pour, it was raining so hard you could barley see. What could be the cause for the light to come on for such a short period and then everything seems to be fine? Could it have been from a wet connection?