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honda bf150 questions

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bigtuna189

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Have a 2005 bf150, acts like low batteries but all new, when i attempt to start the motor, all the usual lights and beeps, the voltage gauge goes to 0 and no engine turnover, no starter activation either, #2 power tilt will only raise the motor around 20 percent up then makes clicking noise, have 12.7 volts at starter solenoid, any thoughts on this?

thanks
John
 
When you say batteries, does that mean more than one in parallel? Have you tried another battery just in case the new one is not in good shape? Also convenient to measure voltage while starter or tilt is engaged. Measuring without load you can have a good voltage but this can drop way down if the battery is not good or if you have a bad contact between battery and user (starter, tilt, etc). I suspect the 12.7 is without load, can you confirm? Next thing; measure on the actual battery with load and do the same again at starter solenoid with load. If voltage drops excessively at both points: bad, uncharged or bad terminal at battery. If only excessive voltage drop at starter solenoid: bad contact between battery and starter solenoid (wiring, relay, corroded ground or connection). Hope this helps. Remember, voltage measurements should always be taken with load, if not, pretty much useless in cases like this.
 
These are all unloaded voltage measurements I observed, I think I need to find if voltage reference points are present, I have 12.7 v at solenoid, nothing at starter, the fuses under cowling, one group has voltage the other group does not, these are the 10-15-30s in fuse compartment, I did find an online manual to use, any other thoughts on this for progression of diagnosis, I will verify voltage drop and report back, also have installed 2 new 1000a batteries that are verified good, this problem started with the old batteries, One item to note is when ignition key turned on gauges zero out, Thanks, John
 
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Try bypassing your battery cables with a set of auto jumper cables connected directly to the engine. If that works, replace the cables. They can look perfectly good, but be badly corroded inside under the sheath.
 
Hi bigtuna, as mentioned, take loaded measurements, unloaded ones are pretty much worthless. Start at the battery and work your way to the end user (starter, tilt) with the schematic. A little voltage drop at the battery with starter engaged of a couple of volts is ok. I have BF200´s, looking at the schematic, next item I would measure would be Main V+ Terminal (item 27) of the attached schematic (BF200 for reference, may be different for the BF175) and check again with load. If there is no voltage drop at Main V+ Terminal (27) with load, the most probable cause is the parallel +12V cable that feeds the Starter (25) from the Battery (29). One suspect is the main power cables in the flexible conduit that runs into the engine. These cables can break internally over the years with the flex cycles of the tilting or even corrode inside the insulation. One quick check can be jumper cables to the starter, but be careful and make sure you know what you are doing, polarity, etc. +12V at Solenoid (25) "W cable" tells me you are trying to start the engine and that the Starter circuit of the Main Relay is closed, so I suspect you will have +12V at Terminal (27) without excessive V drop and I think you are looking at the main lines that run from the battery to the engine.
 
BF200.jpg
 
Hope this helps. By the way, Tilt Motor (19) gets power from Tilt Relay (21) that gets power from Starter (25), so I´m pretty sure its going to be your feeder cables, but make sure your engine ground is good too. As I say, some jumper cables can help with quick troubleshooting.
 
Another thought, also check voltage with load at the output of the related battery main switch (could have bad internal contacts or bad terminals at the back). This is another hotspot together with the main feeder cables inside the conduits.
 
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