testing trim sender

[sinkunit0]

a while ago the earth wire on 1999 200 efi trim sender unit corroded through.i fixed this worked for awhile. when this happened the trim guauge pointed vertical off the scale.this has happened again.i have cheched and redone earth connection with no difference. how can i test to see if sender unit is at fault.

 

[Hooty]

Re: testing trim sender

The trim gauge is a volt meter and the sending unit is a variable resistor. You can use a volt meter in place of the gauge. If the voltage goes up and down as the engine is trimmed up and down, the sending unit is working.<br /><br />c/6<br />Hooty

 

[sinkunit0]

Re: testing trim sender

when i put the voltage meter in line i.e where the join is before contol lead i get a steady reading when i trim up and dowm.if the unit was working it should go up and dowm ?<br />but when i make a circuit out of the sender to test the resistance it goes up as the motor goes down and visa versa. somewhat confused

 

[Hooty]

Re: testing trim sender

If the resistance chages when you operate the sender, then it's (the sender) okay. Check all the wiring connections for corrosion or looseyness. If they all look good, I'd suspect the gauge.<br /><br />c/6<br />Hooty