Compression Ignition Addict
Join Date: Dec 2007
Thanked 311 Times in 300 Posts
Mentioned: 8 Post(s)
Quoted: 157 Post(s)
Feedback Score: 3 reviews
Mine cranks slower even with new batteries but if it's "barely" starting now, you're gonna have trouble when it gets Really cold!
Load Test time I'd think.... Make sure they're fully charged first, test them individually, and because they're big batteries make sure the guy "puts-the-spurs" to 'em (people are saying their bad batteries are passing a Half-A$$ed load test, with only a 100Amp load on them at Auto Parts stores.). So you want a 300-400A load to really test these batteries...
Also remember, once the PCM see less than 100rpm (normal is 150-200) it stops sending the IDM signal to even Try to start.