regulator/rectifier question, mariner 90hp

[ksgoosekillr]

I have a 90HP mariner, 1991 model 3 cyl. This is the one with the regulator and rectifier all as one component. mercury part no 815279A2, or sierra no 18-5741.... my question is this, the voltage reg side is working great and maintaining a steady charge but i am not getting a signal to my tach, These thing cost a ton to replace.... what do you guys reccomend a guy to do here. it is the one with 5 ring terminal leads coming out of a sealed regualtor box. I have found one with the 3 screw terminal on the top plus the ground with the same mercury number? is this interchangable, with the 2 red power wires, 2 yellow stator wires and grey tach wire? i assume i have those right? any help would be much appreciated

 

[Chris1956]

Re: regulator/rectifier question, mariner 90hp

First check the wiring from the VR to your tach. Make sure the wire is not shorted to ground or has a broken or bad connector. Ohm it from the tach to the VR.

If the wire checks out and you are sure the gauge is good and has +12V and ground connections that are good, tap into one of the yellow stator wires. That is the source of the tach signal.

 

[ksgoosekillr]

Re: regulator/rectifier question, mariner 90hp

So what your saying here is that the VR/RECT box is just a connection between the stator (yellow) wire and the tach (grey) wire? Why is this not run directly? Does it matter which of the stator wires i tap into for the tach signal? Ill double check the ground and ohm the tach wire this evening... the tach is brand new and set to the mercury setting 6/12

 

[Chris1956]

Re: regulator/rectifier question, mariner 90hp

Yes, the raw stator signal runs the tacho. Either side of the stator is fine.

 

[ksgoosekillr]

Re: regulator/rectifier question, mariner 90hp

What is adequate voltage for these regulators? I am goign to check that as well because my (new last yr) optima was fried, With the engine running are they puttting out the 16v?

THANKS FOR YOUR HELP! i really appreciate it

 

[saumon]

Re: regulator/rectifier question, mariner 90hp

without voltage regulator: +/- 16 volts at WOT
with voltage regulator: 14.4 volts