MikeWa

Mine is off with the key. Mike

Welcome to the site. Mike

I would start at the switch. Jumper one side to ground then the other. Both with the switch pushed on and the ignition on. Mike

You can use a jumper wire to track the problem. Work your way to ground from the horn. Jump first one side of the switch then the other etc. As a side note. Due to the voltage readings you got I am surprised it is the ground side even though that is the usual culprit. ("Ground is at .52vDC Power to horn was 10.52VDC and battery was 12.52VDC") Mike

Heal fast Mark Mike

Power comes in on one spade. The switch provides ground on the other. To test these set your DVOM to volts and connect one lead (black) to the battery ground. Touch the other lead (red) to one of the spades. With the key on press the horn button. Record your reading. Now connect the red lead to the other spade. Press the horn button again and record your reading. Turn the key off One of your readings should have been very close to battery voltage. That is the positive spade. The other should have been under about one volt. That is the ground circuit through the switch. If no readings were near battery voltage something is wrong with the supply (power) side. Fuse connections or wires. If you had a reading near battery voltage but the other did not go to near zero (under a volt) when you pressed the horn button the ground control side is at fault. Possibly a faulty switch, the actual ground connection, or the wiring. Mike

Two things. 1st check the voltage to the horns with the horns hooked up & trying to operate. Reading should be within .2v of battery reading. 2. Check the ground with the horns hooked up trying to operate. The easy way to check this ground is one lead of your meter on the horn ground terminal the other on the battery negative. Reading should be under 1 volt. This tests the horn switch and ground. Mike

Most cars have more than one cat now days. Mike

Dump out the fuel and start fresh. Mike

Fork pressure as mentioned above, tire pressure stay on the high side, head bearing don't let the motorcycle shop blow you off on this. Find someone to do it right or do it yourself. Good Luck Mike

Your mileage does not sound bad for riding around town or even mixed riding. But it is a little low for highway riding. Make sure your carbs are synced and properly adjusted. Then check your mileage on a non stop highway ride under about 75 mph. That will give a good repeatable baseline to work from. Also winter fuel will drop the mileage considerably so watch for that. There is a place for exotic spark plugs. They can help delay the effects of other engine problems such as valve seals or rings, rich or lean mixtures etc. But if your engine is working as designed they won't do much. Once the fuel mixture ignites the spark plug becomes irrelevant. Mike

George. That is a classic plugged cat story. I have seen it many times. There are several ways to check for this. Engine vacuum is a big one. Also exhaust back pressure. Drill a small hole and test with your vacuum or fuel pump gauge. Yes most vacuum gauges also have a small pressure scale. Then braze it over or use a sheet metal screw to plug it. Sometimes just removing the O2 sensor will relieve enough pressure to let the engine run better. Glad you found it and got it whipped. Mike

J&M Audio has several. http://www.jmcorp.com/index.htm Mike

Got mine used on e-bay for $20.00. I Googled the Denso part number. But for 200 dollars I feel your pain. Mike

Why would you want to go with a 12v auto flasher? Mike

My goodness what a harrowing story. Get well soon. Mike

I wrote earlier about my new to me 2010 Venture seeming to lean more in tight turns. http://www.venturerider.org/forum/showthread.php?threadid=88703 Well I finally figured out the turn part. The riders seat is slightly malformed and was not fitting under the latch on the back side of it. Instead it was sitting on top. This caused the rear of the seat to be elevated. That is what was giving me a very nose down feeling when making a tight turn. Mike

The low fuel light starts dim and gets brighter. It generally begins to illuminate about the same time the gage switches to the counter. When the gage switches you usually have 5 to 15 miles until reserve. I would watch the gage more than the light as the light may be hard to see in daylight or may still be in dim mode. Running out of gas and having to switch to reserve is a pretty distinct indicator that you are down to about your last gallon. This has saved me from running completely out on more than one occasion. Mike

Glad to hear he missed. Mike

Very nice looking Venture. Mike

Bad battery connections, bad battery, starter relay, starter. Test in that order. Mike

You can get a free blue tarp at Harbor Freight. Mike

Nice trailer John. Mike

Could be shock. Could be swing arm bushings. If it is consistent and you just have to know use a stethoscope to isolate the source. Mike

Rodney If you are thinking about going to the doctor then GO. There are so many serious illnesses out there it can be dangerous to not get medical attention. If it turns out to be nothing then you will be reassured. You might even get some medication to ease the symptoms. If it turns out to be serious then it is a good thing you went. Best of luck. Get better soon. Mike