List 12v to Both Engines

[Bob Bradley]

I'm trying to help my son in law with a weird electricak gremlin. He cranked his port engine for 30 sec or so while holding the parallel switch trying to reprime it. Subsequently hit start again and had no power to the starter. Tried cranking the stand engine and had no power there either. I got involved and disconnected the parallel switch thinking it is the only common element between the engines. Still no power to either engine. I'm at a loss. Fuses all are good.

[Bob Bradley]

My phone won't let me edit the post. No power to sbd or port engine.

[Captain Ralph]

What engines on what boat?

[Bob Bradley]

671s. 38C. I think we may have solved it. I was blaming the parallel solenoid, but its looking like both Guest battery switches failed simultaneously.

[Captain Ralph]

Little battery switches really *&^%&*. If you have never seen the inside, a copper foil on a plastic disk. It is common to smoke the smaller (cost effective) switches.

Keep us up on what you continue to find.

[jim rosenthal]

Blue Sea Systems makes robust battery switches. At least I haven't cooked any, yet.

[Avenger]

Both of my Guest switches failed. Not at the same time. The plastic housings break and the spring pressure separates the contacts. I don't know that it's necessarily Guests fault. They were probably over forty years old. However, I replaced with Blue Seas also.

[Bob Bradley]

These appear to be original. One engine always cranked slower than the other. He was cranking that one with the parallel engaged. We suspect that switch failed while he was cranking it and the parallel switch transfered the load to the other switch, cooking it. We'll have 2 new ones on Tuesday. Hopefully that solves it for good.

[Bob Bradley]

Blue Sea Systems makes robust battery switches. At least I haven't cooked any, yet.

Do they match the footprint of he Guest? These are integrated into the electrical panel and would be a real pita to alter.

[Captain Ralph]

If these switches were the original Guest switches in the Hatt box, the new Guest switches look different but bolt rite in.