suburban slow crank

[trblshooter]

My ex wife has an 05 suburban that is starting to struggle to turn over when starting. The battery is new and had it tested just to make sure that wasn't the problem. Alternator is working fine.

It's an intermittent problem, hot/cold makes no difference. But it sounds like the starter has heat soak, it'll struggle to turn over once but then spin right up and start. I'm new to the full size GM game but heat soak on a late model stock vehicle seems odd. Any help would be appreciated.

[JC316]

I would take a good hard look at the wiring. Make sure that the grounds are clean and tight, make sure there is no corrosion on the positive sides. There is also a possibility that it's a new dead battery. I have gotten several off the shelf that are dead.

[slow84lx]

Connection or wiring. Feel the cables for a soft spot. Corrosion can build up under the rubber casing and a bad cable can look good. I've had brand new batteries test good but be bad.

[orphan Shelby]

If ya got a meter, check voltage drop at pos cable and starter.

[jyro]

OR, clean the battery terminals

[jyro]

if the lights dim when starting, it's a bad connection or battery, if they don't dim, the starter is bad