Solenoid on 72 Blazer

[K5Danny]

Thanks for the pics and info guys! I about killed my battery trying to crank the Blazer unsuccessfully on Thursday. I hooked my charger up to it after work yesterday and flipped it to the "high amp engine start" option. Turned the ignition switch and the engine fired up instantly. I let the battery charge up for a while and tried cranking without the charger. It was very sluggish to turn over, but cranked. I think I'm going to need a battery with some better cranking amps or maybe this battery is just going bad.