40 hp tldi

[sylman]

Motor won't start. checked fuses.have power when key turned. thought it was ignition switch, replaced with no help. kill switch checks good.where do I look next?

 

[pvanv]

Re: 40 hp tldi

The Factory service manual will have the schematics you need to diagnose the start and run circuits. Does it crank, or is it just dead?

 

[sylman]

Re: 40 hp tldi

Completely dead.no sound or movement of any kind

 

[pvanv]

Re: 40 hp tldi

Probably a bad connection of some sort, or could be a fault at the solenoid, etc. Diagnose from the (fully-charged, adequately-sized) battery through to the start solenoid. BTW, a stop switch issue would not prevent cranking. Once you have the Factory service manual, the schematics will help you diagnose the issue. Did you check the (one and only) fuse on the motor?

 

[sylman]

Re: 40 hp tldi

3 fuses in a block on motor, is there one I am missing? Do not have manual or schematic. can I download from somewhere?

 

[pvanv]

Re: 40 hp tldi

Depending on your actual model/serial, you could have a 3-bank fuse block, with one 15, one 25, and one 30 amp fuse. If so, is there power to the fuses? You would need the Factory service manual, available from any dealer (even me), for the schematics and to diagnose the motor. Because the manual is copyrighted, it is not available for free download. The TLDI is not a shade tree mechanic sort of unit; it's pretty complex. In general, if you are not comfortable with complex electric configurations, I recommend that you see your local dealer for assistance.

Is there power to the starter solenoid? Is there power to the ECU? Do the warning lamps light? Does the warning buzzer ever sound? If there is a tachometer, what does it do, and under what circumstances? If a power tilt/trim model, is there power to the T/T solenoids, and does the power tilt work?

 

[sylman]

Re: 40 hp tldi

I don't know on the solenoid. What is ecu? Yep 3 fuses, all replaced. can't afford mechanic. will have to buy manual. buzzer and all switches have power and work. PTT works at motor and throttle. we verified power everywhere we could think of. Tach was normal when it was shutoff at least that is what I was told. had been run several times that day when suddenly it would not start.

 

[pvanv]

Re: 40 hp tldi

ECU is the Electronic Control Unit (the computer). Is your specific model an MD40A or is it an MD40B, or B2?
If you jumper the start solenoid, does the starter crank? Is there a good ground to the motor? What size is the battery? Is the battery fully charged?

 

[sylman]

Re: 40 hp tldi

NSD40B. 3T4-1 serial #025549XC.battery fully charged. 650 CCA only 1 year old. can't figure out how to jump solenoid.battery ground is good

 

[pvanv]

Re: 40 hp tldi

The battery is too small for reliable initialization of the ECU. That aside, the starter should crank. If you aren't able to figure out how to jumper the start solenoid, you should either get some more expert assistance, or get to your local servicing dealer.

If the motor or control is in gear, the starter will not operate. Did you check for power to the fuses, power to the solenoid, and power to the starter itself? Does an analog ohm meter show a good ground connection between the battery and the block?