My Blazer has a newer rebuilt alternator in it and is getting close to needing a new battery. What I would like to know, is if it would be possible to get a more powerful battery (maybe an Optima deep cycle one?) and have it fit well. The reason I want a more powerful battery, or maybe a different alternator (whichever, opinions would be great) is that whenever I put my Blazer in 4 Hi or the ABS kicks in, the headlights dim very noticeably. With the ABS, they pulse in rhythm to the brakes. I was told a better battery with a bigger reserve would cure this, and it makes sense. I just don't know how big it would have to be or if it would fit,

Thanks for any help!

Oh, it's a 1999 LT 4x4 and this is the 5th or 6th year on this battery I think

 

yeah, if your batter is 5-6 years old it probably need replacing.

but is your current battery the correct size or bigger that what it needs?

 

I think the battery is the right size for the engine, its an Interstate 75 month battery with 815 ca, don't remember the cca

 

i just got a 97 blazer lt and i when i hit my breaks in the snow or ice my abs kicks in and when it does my headlights dim and radio turns off i was wondering y its doing this is it a bad ground somewhere