I have an 89 D21 which I rebuilt the motor due to the previous owner overheating. I have about six thousand miles on the rebuild and it runs strong with no leaks. Several months after the rebuild I encountered starting problems during which I could hear the relays clicking but the starter solenoid would not engage. I replaced the interlock relay on the fender well thinking that was the last link in the chain before the starter solenoid. That did not cure the problem so I replaced the starter which had tested bad when removed. New starter did not solve the problem. Still ocasssionaly have to engage the key several times to the start position before I get the starter to engage. Seems to start quicker on subsequent starts , but I may be imagining that. I can hear the relays clicking in the fender well, and if I hold the key to start and then release the clutch I hear the relays react to the position of the clutch pedal switch as I depress or release it. Another bad starter solenoid? Couple of simultaneous other problems that may be symptons for the larger problem. The battery is boiling out the battery fluid at a slow rate, static battery voltage is 13.1 and the alternator charges at 14.5 volts, both values seem normal. A leftover from the previous owner is an aftermarket battery cable to the starter that is about five feet long which is coiled up and zip tied in the fender well. I know that causes a high current draw and I wonder if that is one of the problems contributing to the intermittent starter woes. One other thought I have had is maybe I have a bad ground causing both the weak start and a high current situation that affects the battery adversly. Am getting ready to get the service manual out and follow the troubleshooting guide but would appreciate any ideas or comments. Thanks.