Fuse #19 has power then it doesn't... help?

[Marlon Targa 86]

Problem:

Fuse #19 which powers the rear right light assembly measures zero volts with ignition on. When I disconnect the bottom wire connected to the fuse, I measure the full 12.4 volts at the top screw op that fuse.

I connected the bottom wire to fuse #18 ( rear left light assembly) and then all the light bulbs on the right rear work. But when I connect it back to fuse #19, the lights don't work and I get zero volts.

Any clues what's going here?

Marlon

[rick-l]

You have resistance in the supply to fuse 19 >> the resistance of the bulbs. It forms a voltage divider between it and the bulbs. Clean the fuse contacts. Use your voltmeter to see where the drop occurs.

[Marlon Targa 86]

Originally Posted by rick-l

You have resistance in the supply to fuse 19 >> the resistance of the bulbs. It forms a voltage divider between it and the bulbs. Clean the fuse contacts. Use your voltmeter to see where the drop occurs.

But how come the bulbs function fine when powered by fuse #18?

Or maybe I'm not getting it? Sorry, fairly new to this fuse thing.

Marlon

[rick-l]

V(batt): 12 voltage
V(case_1): 11.9502 voltage
V(case_2): 0.142292 voltage
V(case_3): 12 voltage

the 12 ohms is the 12 watts of lights.
the 50 m is the wiring resistance




Edit 1000 is the corrosion on the splice/fuse

[dshepp806]

probably time for some good cleaning, retensioning and retightening on that fuse block....

Best!

Doyle

[Marlon Targa 86]

Originally Posted by rick-l

the 12 ohms is the 12 watts of lights.
the 50 m is the wiring resistance




Edit 1000 is the corrosion on the splice/fuse

Yeah, I think I understand. I'll try jumping across the fuse and see if it works then.