| carl mciver wrote:
| > Will the batteries being dead have an effect on the speedometer?
| I think they can. Bad SI (Service Indicator) batteries screw up a
| bunch of stuff in there. As well, I understand that driving won't
| recharge them by itself. You need to charge them before use. This is
| why a lot of people swapping in replacements mount them remotely and
| > If the sender _and_ cluster is good, what else could be at fault
| Well, I'm not sure you've determined the sender is good. Then, there's
| all that wiring in there. Check for continuity from the sender
| connector to the other end of the wires at the speedo head. If there's
| a break, look under the car for brittle or burnt (exhaust leaks will
| cook 'em) places where the wire might be broken. If you have
| continuity, try replacing the sender in the diff. It's easy and
| relatively cheap. If that fails, you're down to the cluster ...
| C.R. Krieger
The sender was the first thing I changed out, and was disappointed to
find it no better. The previous owner had replaced the cluster, and when I
brought it home from his place the batteries charged up on the trip, which
was nice. The ones in the second cluster aren't dead as a doornail, so
maybe they will charge up also. Don't know if I'll have the opportunity to
drive it that long, though.
The wiring to the sender had all been checked to be good before I
cracked open the cluster and found the corroded main board, so I tried to
repair it as best I could figure out. Repairing circuit boards is a
previous career, but I usually had more information to go on. Using the
second board as a pattern I'm going to redo my patch job, but if I have a
couple other possible places to look I'd feel a lot better, since I'm not
100% confident that this will solve the problem. There's such a lack of
decent information in the wiring diagrams that the wiring shown for inside
the cluster that I'm starting to doubt it's accuracy.