What I tried to say it both of mine do the same as being described herein. After the GP indicator lights go off the GPs are still heating. I listen for the "click" and notice the other dash indicator lights brighten after about 45 seconds. The '84's GP light does not stay on as long as the one on the '87. We have already had some rather cold mornings here in the Connecticut River Valley. Without the block heater plugged in, I used the two cycle method before even attempting to engage the starter.
Off subject for the most part . . . when installing the cord for the block heater I read previous threads explaining the routing and final location for the plug. I thought about it and decided to make it really easy to get at and also take care of the problem of remembering it was plugged in. By cutting a hole in the top of the hood in clear view from the driver's seat, running the cord and plug up from the underside you can see if it is plugged in or not (in case you forget) and sealing around the cord with roofing tar keeps water from dripping onto the air filter housing.
