Delco GM Radio Noise Suppression manual
 

This is a COPY of the 13 pg Delco Radio Suppression Manual by GM, (15 Pgs) I found it at a swap, I made a few copy’s to sell, shows causes and fixes, tach filter, hood ground, shows 6 common fixes, gives pics and part #’s, alt whine, switch pops, so on, shows trouble shooting, handy manual if you have radio noise, $10 plus ship.