1989 force 125hp tachometer issue(veethree)

[puffitu]

So the other day I’m out testing the new powerhead and all goes as planed-well with the exception that my temp gauge fogged up then the voltage gage shot way up. I stopped immediately and looked it over. Went to turn key and NOTHING....looked and checked everything. Voltage checked all pertinent connections -all fine. Then came across the circuit breaker and it was tripped. That fired it right up and so, a bit gun shy went ahead and performed some speed tests and the thing runs like a rocket. Got it back to the house and started performing the usual flushing and other ritualistic checks and WHOA!!! I noticed hinge pin on the transom, where the motor hinges to go up and down-well one side was completely snapped. So just hanging on with one side of the through pin/screw. Don’t know if this happened on the trailer or as I was buzzing around. I did swap the whole thing out beacause not only did I have a new old spare from when the guy sold me this new/old powerhead and/or motor but that I have a conveniently located tree branch over where I park the boat. So that’s my story. I just hooked up the trim and tilt hydrolic lines and seems to be operating just fine. Swapped out the circuit breaker, and voltage regulator with a spare I had. All put back together and fired it up...so now my tachometer is pegged and wont move. Is there any test procedures I should be looking at? ​

 

[jerryjerry05]

Change the regulator back.

 

[puffitu]

I did and tach still pegged...no change

 

[The Force power]

I did and tach still pegged...no change

Is the voltage-gauge is reading the correct voltage?

 

[puffitu]

Yes sir-voltage gage is where it’s supposed to be

 

[The Force power]

logic would dictate a faulty voltage regulator, sorry I'm not much help here other then verify that the voltage is actual flowing into the battery

 

[puffitu]

I’m going to test the reg next

 

[puffitu]

Am I supposed to be reading 12v at the tach coming from ign switch in on position? How much v’s at sender post?

 

[The Force power]

Am I supposed to be reading 12v at the tach coming from ign switch in on position? How much v’s at sender post?

That would be 12 volt DC, but the sender would be AC, not sure????

 

[puffitu]

ahhh yep-ill do some digging when I get a chance on her next

 

[jerryjerry05]

Should be 12v to the tach.
The V to the sending unit should be 12 once it makes complete contact making the buzzer buzz.
It might start low and work it's way up as it makes better contact??

 

[puffitu]

That makes sense-thanks J

 

[puffitu]

Hey guys
got a chance to do some digging and still got a pegged tach and now I just found my temp gage got some burn mark on it. As I recall the whole thing stated when At WOT ; I noticed the temp gage going crazy then circuit breaker popped then when finally back home the tach is still pegged to this moment. Any input ? I checked wiring and all seems as it should be. I Swapped rectifier.

 

[puffitu]

By the way there’s a resistor/connected between the I and S terminals-normal??

 

[The Force power]

Hey guys
got a chance to do some digging and still got a pegged tach and now I just found my temp gage got some burn mark on it. As I recall the whole thing stated when At WOT ; I noticed the temp gage going crazy then circuit breaker popped then when finally back home the tach is still pegged to this moment. Any input ? I checked wiring and all seems as it should be. I Swapped rectifier.

When you say "pegged tach" you mean even with the motor not running?
The temp gauge is the one that's burnt? or the resister?

 

[puffitu]

Yes pegged tach when not running-and yes the resistor looks like it got real hot

 

[The Force power]

Yes pegged tach when not running-and yes the resistor looks like it got real hot

I'd say the Tach. is pooched & the resister on the temp gauge, maybe one caused the other??
I can't say as I don't know the set-up in the boat

 

[puffitu]

Thanks-I’m looking into new ones but gun shy because I still don’t know what really caused it

 

[The Force power]

Thanks-I’m looking into new ones but gun shy because I still don’t know what really caused it

I hear you!
My guess would be the regulator/rectifier and/or boat wiring

 

[puffitu]

Sucks because the gages were a year old. I think something got mashed while I was tugging on the steering cable when I did the transom clamp bracket swap out. All wiring was triple checked. But at wot as I said, something initiated the circuit breaker to trip( temp gage; but what could’ve poached the temp gage). I’m a bit confused about the jumper resistor thing though