So I bought the Actron scanner with the light and the beep. It was kinda hard to read, because the light would sometimes not follow the pattern or I was not reading it correctly.

The latter being the most likely cause. I dont really work on OBD I. I have pre-OBD cars, (67 Pontiac's) and OBD II cars so OBD I is new to me..

But on another forum the scanner that most were using is this one. With Digital readout. Ill post a video once I have used it.

Dave

http://www.ebay.com/itm/291022475559...84.m1439.l2649

 

Video posted.

 

I have that code reader and it works pretty well.
I made a web page showing how to use the code reader for the KOEO (code reading) and KOER (running diagnostic tests). I also show how to do the same tests using the manual method with a test light.
http://home.budget.net/~klricks/F150/Ford_OBDI.html