Fuse Block Done?

[sxecafe]

The other night I was working on my CB550. My socket wrench hit the block, which was uncovered, it sparked pretty bad, blew the 15A fuse and when I turned the key and NOTHING happened. Traced back through the loom with a multimeter and I could find almost NO power.

I remember there was a way to test if the block is getting power... was it just touching the positive lead to the metal on the fuse block?

I want to make sure it's the fuse block that needs replacing before I go chasing my tail... I know a new blade style fuse block is $10 but its more the time to change things out that I'm worried about. With my luck, it will be something completely different.

 

[kicker]

It may have cooked a connection somewhere.
Use the continuity function on the meter (usually gives an audible beep when there is continuity i.e. an unbroken circuit) to find any broken connections.

 

[Rich Ard]

The other night I was working on my CB550. My socket wrench hit the block, which was uncovered, it sparked pretty bad, blew the 15A fuse and when I turned the key and NOTHING happened. Traced back through the loom with a multimeter and I could find almost NO power.

I remember there was a way to test if the block is getting power... was it just touching the positive lead to the metal on the fuse block?

I want to make sure it's the fuse block that needs replacing before I go chasing my tail... I know a new blade style fuse block is $10 but its more the time to change things out that I'm worried about. With my luck, it will be something completely different.

Start at the fuse and go from there. Set your multimeter to 20V DC, ignition on, with the positive lead at the positive pole on the battery and the negative lead just before the fuse block...then just after the fuse block. If you find that you're getting power there, shut it down and start checking continuity throughout the harness.

 

[sxecafe]

Rich Ard, I tested the connection to the fuse and found a full 12V. I didnt have time to start testing the rest of the loom. I'll try to get to that this weekend but I guess that means the fuse box is good, huh?

 

[SONICJK]

Did you check the wire coming out of the fusebox? ;D

Also if youre using glass fuses they are notoriously shitty, you may well have just put a bad replacement in.

 

[sxecafe]

I used the multi on the wires that should have power to them from the batt to the ignition and got nothing but I'm getting 12V at the actual fuse box. You're prob right, SONICJK, it's either the wires at the fuse box or maybe the glass fuse looks good but is FUBAR. Im hoping it's something simple. I dont want to chase my tail on this. Done enough with the wiring on this bike so far and I just got it running!

 

[sxecafe]

Traced down the issue. It was a cooked wire coming from the red (15a) fuse wire. I crimped all new ends for the fuse block connector and it fired up.

 

[Bert Jan]

Traced down the issue. It was a cooked wire coming from the red (15a) fuse wire. I crimped all new ends for the fuse block connector and it fired up.

The fuseboxes on these old bikes are 50% of the time the problem. The wires inside it, or the connection plug from it is corroded so many times.. better replace the whole fusebox all together with thrustworthy stuff.