Just finished reassembly of 72 CB 500, all stock, just tooks things apart to clean everything. Upon starting and running i noticed a few issues with lighting. The headlight, front/rear right turn signals work and blink. The left front turn signal goes on and stays on (no blink), the left rear turn signal does not light at all--replaced the bulb---still nothing. The brake lamp lights when brake depressed, should it also be on as a running rear light as well? It;s not, only lights when brake depressed. I have very limited knowledge...anyone shed some items i should be looking at? Thanks!