I have a 1975 Carabela that I have rebuilt and is just about complete. My last issue (I hope) is the electrical system.
I cannot run the head lamp, tail light and brake light at the same time. When I attempt this they all just dim down to a very weak level.
Situation: With the headlight & tail lights on they burn ok at idle and a bit better at just above and level out after that. If I hit the brake then they all go out (or very dim). No amount of RPM will bring them back but if I let off the brake they pop right back up. With the headlight off brake light work just fine.
Background: I had to replace the headlight & tail brake light. They were broken and I took care to get replacements to match.
Bike is running well and system is 6 volts
Head Light is 15watt/15watt (I only have one element connected)
Tail Light is 3 watt
Brake Light is 5 watt.
By my estimate I should need about 3.5 to 4 amps of current at 6 volts.
I have tested with a 6 volt battery and all lights together pull about 3.1 amps.
I have connected the battery as the bikes power source (not running) and all of the lights work, so I am assuming no electrical short.
When I try to measure the DC voltage and current on the bike is difficult because I have a digital meter. The values are jumping all around.
Is the system just tired not able to push enough power.
I welcome any assistance and any direction for my next step in getting on the road.