clean battery post and wires reconnect them and ensure they aRe tight get the voltage tested for free at these automotive stores. 12v when not running, 14v when car is running.
The best replacement battery i use in all my Vw's and other cars and trucks is Bosch..They are usually right over 100 bux but the are dependable, They also come with a 7 year warrenty.
Im running an optima redtop 1000 cca. Starts like a champ in -10 degree weather.
The other day I installed my Optima yellow top that was intended for my S10 into the GTI. Had to cram the battery cover top on a bit, but its on there! Funny now the car starts up alot faster. It always seemed like since I got this car it was slow to start, as if the battery was always low...
I upgraded to an Optima yellow top D35 in my GTI probably about six months go..no problems w/ it at all..the batter cover doesnt fit perfect, but you can make it work...i'm runnin bags with dual compressors and also a jl audio sub/amp system so i needed something with more power..which the yellow top has
I had an Optima 5 or 6 years ago but I heard the quality has went down and the warranty isn't as good as it used to be. I picked up a Deka intimidator deep cycle battery and It's by far the best battery I've owned.
I do have a Yellow top Optima battery in my VW Jetta MKV 2007 and I just had one problem a little time ago since one of the terminals needed to be tight again... but that's pretty much it, it works just fine.
I had numerous Optima batteries in my car for about 12 years and the only reason I kept going with them was because they replaced it under warranty every time they went bad.
Switched to a stock mk5 4cyl battery though as the Deka couldn't handle sitting for more than a couple days without being on a trickle charger.
I go for the best, Optima Yellow Top group size 35 from Johnson Controls. I have owned them before, loved their batteries, a lot of In car Electronics, lights, Sound systems. I prefer Optima Yellow Tops. I installed the new battery, idle issue went away instantly. Driving home that night from work, fire started shooting out from under the hood scoop. Both the fire department and insurance company stated the fire started from the acid in the battery, originating from a single point on the battery. Wiring harness and vacuum lines were toast. Insurance company declared it a total loss.
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