Turn key lose all power
 

Hi I'm having sort of problem ... My 2001 blazer will have power so lights will come on inside truck and whatnot but when I try to start it it just clicks and I lose all power ... Then I gotta mess with the battery terminals to get power again ... Then try to start and it loses power again ... I know it's not the battery or starter because I just bought a new optima red top and a new starter ... And help/suggestions/info are greatly appreciated thanks

Have you tested for power at the ends of your main battery cables to make sure that they are good after they try to pass high amps? Sometimes the fusible links can pass through low amperage power, but open up when high amps are requested.

The cables leading off the battery? No I have tested all my fuses and fuse box to make sure there wasn't a short ... What cables should I test?

Sounds like a bad ground or maybe corroded cable inside somewhere... I would check all grounds first

Lost power
 

Same problem with my 2001 blazer have lights but not sure if alternator or starter battery didn't hold high voltage

This thread is 8 years old. Might want to start your own for a better response...