Hi all,

I am having a problem where the indicator LED on the cluster is remaining on (not completely on, just dim). Eventually I noticed that the MAHLE MFL16 flasher relay is outputting 3.5V. When unplugging the output of therinal of the relay, the output voltage on the relay is going to 6V. Since I changed the turn lights to LEDs, I re-connected filament bulbs to make sure that this is not load related issue, but to no avail. If the pins of the flasher relays are connected as below, should i see 6V with the output floating?

Pin 49 : Battery positive terminal
Pin 31 : Ground

Thanks in advance.

 

I am not at all familiar with that model of signal flasher device, but if it is a tree terminal flasher then for normal systems the output at the correct supply voltage should alternate between zero and the lamp voltage.
So we need to know, first, is this a standard 3 terminal flasher? Or is there a separate indicator terminal? Did this installation previously function after any changes were made? We are not even told if this is on a car or a motorcycle or possibly a Big Truck with a 24 volt system.
So based on the very little bit of information given, my guess is that the flasher has failed and should be replaced.

 

I am not at all familiar with that model of signal flasher device, but if it is a tree terminal flasher then for normal systems the output at the correct supply voltage should alternate between zero and the lamp voltage.
So we need to know, first, is this a standard 3 terminal flasher? Or is there a separate indicator terminal? Did this installation previously function after any changes were made? We are not even told if this is on a car or a motorcycle or possibly a Big Truck with a 24 volt system.
So based on the very little bit of information given, my guess is that the flasher has failed and should be replaced.

Hi MisterBill2. I am not very familiar with flasher relays, but from the little info I found on this relay, it seems like a standard flasher (diagram below). This is my friend's motorcycle and he is not 100% sure if this issue was there before. From what I can understand, he already replaced the flasher and the problem remained. Something which I forgot to mention is that when I removed the output terminal, the meter is reading 6V. Once the terminal is connected to the output, the voltage drops to 3.5V.

 

I am having a problem where the indicator LED on the cluster is remaining on (not completely on, just dim).

Is the LED OEM or is it a modification? Are the turn signals working correctly?

 

I think this is your circuit,

 

OK, then it is time for voltage and resistance checks. First, using the battery terminal connected to the frame as a reference negative, verify that the full battery voltage is present at the "49" terminal of the flasher with everything connected. Then verify that the "31" terminal of the flasher is close to zero when the lights should be lit. This check verifies the power connections. Next, resistance check, test, with the turn signal switch neither left nor right, and with the 49A wire disconnected from the flasher, verify that there is nothing connected (open circuit) between 49A and the frame. If it is not an open circuit then there may be an unintentional grounding because of damaged insulation on that wire. The next check is without the flasher connected. Momentarily connect wire 49 to wire 49A. There should be no sparking. Then with them still connected, operate the turn signal switch. The turn lights should illuminate. If not, or if only one side lights, there may be a switch problem. OR, if the wires pass a point where they flex as the bike is turned, there may be fatigue damage to the wiring. It might also be a corrosion problem in the turn signal power fuse.
Otherwise, if one side works and one side does not, it is either the switch or the connecting wires. These checks offer a way to find out where the problem is. But my guess is that checking the fuse connections first will be easier. Fuses can become corroded.

 

The circuits in post #3 and post #5 are very different, really. the one in #5 looks like a yoo toob cartoon. The round flashers were very different.