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You may not need the alternator rebuilt if the lights come on when you turn on the key and go off after you rev the engine slightly. Once the light goes out, with the engine running check the voltage at the battery. Should be over 14 volts on each. If the gen 1 or 2 gives you a slight glow then...

One thing I forgot to add on battery voltage is if at full charge you have less than 12.5 volts get a new battery. If you have between 12.5 and 12.6 and it won't take any more charging, your battery will be on it's last legs. A new battery will have about 12.85 off the shelf and sometimes you...

As what Cucvrus says low voltage on the battery means your sending high amperage through your system. That is very possibly why the starter relay first went out. High amps burns stuff up. Weak batteries, one or both will do this. It could be your charging system not charging one or both...

I would just charge the batteries then try to start the truck. If you take nearly dead batteries to be tested they will fail the test. 12.1 is dead, but it does say you have good cells, by that I mean not a dead one. If you don't have a charger get one and charge them 1 at a time. I know I can't...