Originally Posted by Olivergm
tachometer lights up when I turn on the starter battery switch but shuts down if I push the*Start button. Not even a click on the starter motor solenoid... Starter battery drops to 12.2v but connecting another battery via jumpers makes no difference.
Any suggestions on where to start? Volt meter at the starter motor when I'm next down at the boat?
High resistance in the solenoid circuit. Most probably cause is dirty/corroded connection at the starter solenoid. but connectors are also likely suspects.
Check out this recent thread - although this one was a short, the places to look are similar.
Engine starts by itself - Volvo Penta 2030
- Go to Sim Lim Tower and buy a connector pin cleaner - it's a tiny wire brush gizmo that can clean individual male and female pins. You can do it without it but it takes oh so longer.
- Remove the connector from the engine
panel and the two going to the relay box - clean them all up
- Remove the wires from the starter solenoid and clean those up
- If there are multiple wires on the Alternator
B+ terminal remove those and clean those up
- Clean the battery posts and the negative ground wire going to the engine
(You could put other different loads on the battery system and see their performance - if other equipment
has trouble a bad ground is probably indicated. Try hitting the XMT on the VHF
- that would be a good system test.)
You indicate you have the button switch and I can tell you there is not much in that circuit.
There is a start relay and a glow plug
relay - Volvo says the relays are interchangeable. If after cleaning
everything up and you haven't fixed it you could swap the relays. But I doubt you will need to get that far.