Recently acquired yet another Volvo for daughter #1. It's a nice 90 740 NA. Cannot find a manual for it. There is no Bentley Haynes that covers that year and model.
Current problem: Several times when turning the key to start position there is no cranking, no solonoid action, no dimming of lights. No voltage present at the starter solonoid. Neutral start switch OK, ignition switch seems OK. All dash lights come on normally. Battery voltage is OK. It cranks and starts immediately if I jumper 12V to starter solonoid connector at the starter and then the problem goes away.

I believe there may be a relay in the starter circuit but not having a circuit diagram I cannot confirm this or troubleshoot the problem. Anyone have knowledge of the starter circuit or have a diagram of it?