Sabre Aircraft

[rhtrudder]

Having trouble with my 914 , the master light has started to come on in flight and then fade off could it be the rectifier or crook battery, worse when revs are low

 

Greg

 

 

[damkia]

Generally that condition equates to poor alternator output.

 

CAUSES

 

Belt driven? check tension

 

Regulator? (old school not electronic) check gaps

 

Diode open circuit in rectifier block? Disconnect and test

 

Brushes worn? Inspect/replace/re-tension (new springs)

 

 

[rhtrudder]

I think it has Ducati electrics , regulator rectifier gets its power from fixed coils on rear of engine separate from ignition coils when running the voltage meter reads about 14 volts but drops back to 12 after shut down.

 

 

[pylon500]

when running the voltage meter reads about 14 volts but drops back to 12 after shut down.

Sounds more like the battery dying, not holding it's charge.

Check terminals for tightness and/or corrosion, determine if the battery requires electrolyte, or has been venting off it's acid/gel/mysterious internal fluid.....

 

Check the terminals on the regulator/rectifier, but more likely, get a new battery.

 

 

[airangel]

Check,[wiggle the terminal block going into the regulator], i found poor connections at this point caused similar red light problems

 

 

[rhtrudder]

Thanks for the help , battery spins the engine over OK so I guess it may be loose wires, the engine has nearly 1300 hrs up , how much life can you get out of the reg/rec

 

 

[Birdseye]

In addition, check the voltage of the battery with a decent multimeter off load, preferably disconnected. If its down at 12v after a flight then chances are its stuffed.