Circuit Breaker Question

[mr steve wayne]

I have a 1988 Stratos Bass Boat, I lost all instruments on dashboard (no readings it as if they are all dead. I cannot find a fuse box but I am able to find #8 circuit breakers under the dash. The bolts attached to them a really rusty, but I could get them loosened with penetration oil. My question is this,
How do I know if any of them are bad?
And How can I test them?
Why my boat does not have a fuse box is strange for me. Any feedback is appreciated.
Thank You,
Steve

[shrew]

They do make 12V breakers. My boat uses 12v breakers rather than fuses.

Using a volt meter set to 12V DC:

-> Test the positive and ground at the battery

-> test positive and ground at the battery switch IN, then battery switch OUT.

-> test positive and ground at the battery switch OUT (with the switch ON).

-> Test the positive and ground going into the 12v panel.

-> test positive and ground coming out of the breaker (breaker ON).