Trim indicator is erratic

[peteua636]

I have a 1999 boat with a 5.0L and alpha one drives (2) The starboard trim indicator is at times erratic - the needle on the gauges jumps. I have checked the connections at the gauge. Have traced the wires in side the boat all the way back and have found no problems visually.<br /><br />How do you check the sending unit?<br /><br />any other hints??<br /><br />Thanks<br />Pete

 

[The Marine Doctor]

Re: Trim indicator is erratic

Disconnect the wires and put an ohm meter in place of the guage.<br /><br />It's that easy.<br /><br />TMD

 

[Ralph 123]

Re: Trim indicator is erratic

Make sure the sender is not loose. It could be moving around.<br /><br />Check this out:<br /><br /> http://www.mercstuff.com/trim_limit.htm

 

[gaugeguy]

Re: Trim indicator is erratic

Connect the port side sender to the stbd. gauge. If it is erratic the sender is bad, if it isn't the gauge is the problem.

 

[peteua636]

Re: Trim indicator is erratic

Thanks for all the replys and info!!<br /><br />Doc...will the resistance value go up when trimming up??<br /><br />Thanks<br />pete

 

[Ralph 123]

Re: Trim indicator is erratic

Value up = 167 ohms and 10 ohms down for Merc. OMC Cobra & Volvo DP/SX

 

[peteua636]

Re: Trim indicator is erratic

Thanks Ralph!!

 

[Ralph 123]

Re: Trim indicator is erratic

My Pleasure.