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flashers on AC 5050 diesel

S

SDE

Well-known Member
The lights and turn signals work , but the flashers don't. He bought a new flasher unit, but that didn't fix the problem. I assume that a mouse might have cut the power wire going to the flasher. The flasher has two prongs. If I stick a test light into each receptacle individually and the light doesn't come on, then there isn't any power to it. I am not familiar with his tractor. Can someone tell me where the power comes from? Is it thru the light switch? Does the light switch get its power thru the ignition switch? Is it likely that the light switch is bad? To test that, can I put a jumper wire across the terminals to bypass the switch?
TY
SDE
 
One side of a two prong flasher needs power, whether it comes direct all the time or through the ignition switch. A flasher power prong will often have an X beside it and the prong going out to the lights, or a turn signal switch, will have an L beside it. If the flasher has the X beside a prong that will tell you the wire that should have power so you can chase that wire back to the power source, or provide a new source.

The lights need a good ground. That one may be different but most flasher mounts I'm familiar with are plastic/nylon, and not grounded, basically just an insulated holder for the wire terminals so the flasher can plug into them.
 

two prong flashers are very sensitive to load!!! and must have two bulbs on them to flash... 3 prong flashers fix this by using a separate ground to time the flashers and will work correctly with one bulb, two bulbs or even three bulbs.

So yes.. make sure the flasher has power on one side and two bulbs with good ground connection of the other side. Power usually comes from the flasher switch....
 
If I'm not mistaken, since your turn signals work, then your lamps and your flasher unit are OK. It sounds like a switching problem. I do know the wiring in those is very complicated. They put about twice as many wires in there than necessary. It was altered for use in this country, as I recall, specifically, in the warning light system, with those darn scotchlocks. A wiring diagram might help, but then it might not!
 
Power can come from the ignition switch, a switch to power the flasher or it could be wired so it is hot all the time. The out going side can go to a switch then the lights (turn signal switches are like that) or direct to the lights.

Some tractors on used one flashing warning light. A NAPA NF 552 (thermal type) is a two prong flasher that will flash 1 to 4 incandescent lamps (and there are others).

LED lights should have an electronic type flasher, not thermal, and some of those do require a ground, either via terminal or wire lead.

The third prong on some flashers is for the pilot (indicator) light, not ground.

So, all the info given has been correct depending on what is used. Best solution would be the correct manual with the wiring diagram and being sure you have the right flasher for the number and type of lamps to flash. It appears that should be AC# 70248109 which crosses to a 552 series mechanical flasher, to flash two incandescent bulbs.
 
If it's like my Fiat Oliver, the power to the flasher comes FROM the ignition switch. It's the light switch too. You turn it to different positions for different functions, so you'll have to turn it to the correct position to power the flasher.
 
The third time that I went to his house, he was home. He said that it is to hot to work on now(88). He is in his late seventy's and a Type 1 diabetic. I told him to call me when he is ready for me to work on it. I told him that I would check for power at the flasher and if it is there then it must be a burnt out bulb. Easy fix. The flasher is under the hood and so that will be easy to check also.
Ty for all the info.
SDE
 
(quoted from post at 17:32:08 08/23/21) The third time that I went to his house, he was home. He said that it is to hot to work on now(88). He is in his late seventy's and a Type 1 diabetic. I told him to call me when he is ready for me to work on it. I told him that I would check for power at the flasher and if it is there then it must be a burnt out bulb. Easy fix. The flasher is under the hood and so that will be easy to check also.
Ty for all the info.
SDE
Click to expand...
ood luck & you won't run into this flasher! :)
VbeQ8Xl.jpg
 
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