Intermittent 6.5 non-start

[tdsub]

My 6.5 TD intermittently won't start. Since it had the original lift pump and oil pressure switch ('98 Suburban with 123K miles), I replaced both the LP and the OPS. It ran fine for a few days, then cranked fine but wouldn't start. A couple of days later, it started, but again, today, it won't. Any ideas?

[6.5 Detroit Diesel]

check all your connections. I would start with that. It doesn't take much at all to keep your truck from starting. Both batteries, and the starter. Good luck

[JohnC]

Make sure the shutoff solenoid is at least clicking, and read the codes...