My horn as started having problems - which is bad because DC has a _lot_ of bad drivers. If i'm sitting at a stop light and the engine is just idling - the horn will not work. But if I blip the engine, the horn works while the RPM's are up. My first thought is that my battery might be going bad. I did wake up to a dead battery saturday morning. I spent friday bleeding the brakes (changed out the caramel colored brake fluid for something a bit more clear) but the brake lights don't come on when the ignition switch is "off", right?
Or maybe the horn is going bad and wants a higher voltage to work?
PS: I was at my local autozone - and wanted to pick up a new oil filter. It appears that STP has recalled the SM0-00 filter - i guess they realized that they were putting the wrong filter in a lot of those boxes. Should I just go ahead and order a bunch of filters online?
I also just started having problems with my horn. The horn does not work at idle or steady engine speed. The horn only works when I rev up the engine. This is a safety problem. I too believe this is a battery issue. I need to purchase a battery tender ..... any suggestions?
Have you checked any of the wire connections for corrosion?
I'll check the connections this evening.