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Tach stopped working but still lights up #13853079 01/20/21 05:47 AM
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Fishbonz Online Content OP
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I was coming back to the ramp after a fishing trip when I noticed that my tach had stopped working. I got home and connected the mouse ears to the engine and cranked it up still no RPM`s displayed. It still lights up but that`s all it does. It`s an old school merc.XR4 150 engine. Does anyone have an Idea what could be the problem or recommend a good Merc mechanic?

HE aka Fishbonz


HE aka Fishbonz
Re: Tach stopped working but still lights up [Re: Fishbonz] #13853292 01/20/21 02:40 PM
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boatman025 Offline
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Check regulator We can check it out for you if need us to


Hughes Marine
3855 Osage Lane
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Re: Tach stopped working but still lights up [Re: Fishbonz] #13853365 01/20/21 03:26 PM
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Rotate the cylinder setting rheostat on the back of the tach several times and return it to the original setting.

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Re: Tach stopped working but still lights up [Re: Fishbonz] #13853414 01/20/21 03:52 PM
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What Boatman says. Tach gets it's signal from the regulator. Check and see if you are charging when the motor is running.


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Re: Tach stopped working but still lights up [Re: boatman025] #13853456 01/20/21 04:26 PM
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Originally Posted by boatman025
Check regulator We can check it out for you if need us to

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HE aka Fishbonz
Re: Tach stopped working but still lights up [Re: Micheal] #13853553 01/20/21 07:12 PM
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Originally Posted by Micheal
What Boatman says. Tach gets it's signal from the regulator. Check and see if you are charging when the motor is running.

What do I use to check for charging when motor is running. My boat doesn`t have a batt gage.


HE aka Fishbonz
Re: Tach stopped working but still lights up [Re: Fishbonz] #13853581 01/20/21 07:20 PM
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Use a multi-meter. All you need to do is check the voltage on the battery with the motor stopped and check it again with the motor running. You should get an increase in voltage. Keep in mind, the motor may be charging but still no tach, you may still have a bad regulator.


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Re: Tach stopped working but still lights up [Re: Micheal] #13854258 01/21/21 01:26 AM
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Originally Posted by Micheal
Use a multi-meter. All you need to do is check the voltage on the battery with the motor stopped and check it again with the motor running. You should get an increase in voltage. Keep in mind, the motor may be charging but still no tach, you may still have a bad regulator.

I have Three batteries but Ok .I`ll check it out. I`ll check all three!

Last edited by Fishbonz; 01/21/21 01:28 AM.

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Re: Tach stopped working but still lights up [Re: Fishbonz] #13854369 01/21/21 02:27 AM
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Originally Posted by Fishbonz
Originally Posted by Micheal
Use a multi-meter. All you need to do is check the voltage on the battery with the motor stopped and check it again with the motor running. You should get an increase in voltage. Keep in mind, the motor may be charging but still no tach, you may still have a bad regulator.

I have Three batteries but Ok .I`ll check it out. I`ll check all three!

Only one will be cranking battery. Look for heavy wires running to rear of the boat. Normal battery voltage should be in high 12s without engine running. With engine running look for an increase to 14 or more. I am thinking my Lowrance units show 14.4 while running but I have an Optimax.


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Re: Tach stopped working but still lights up [Re: Stump jumper] #13854546 01/21/21 05:04 AM
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Originally Posted by Stump jumper
Originally Posted by Fishbonz
Originally Posted by Micheal
Use a multi-meter. All you need to do is check the voltage on the battery with the motor stopped and check it again with the motor running. You should get an increase in voltage. Keep in mind, the motor may be charging but still no tach, you may still have a bad regulator.

I have Three batteries but Ok .I`ll check it out. I`ll check all three!

Only one will be cranking battery. Look for heavy wires running to rear of the boat. Normal battery voltage should be in high 12s without engine running. With engine running look for an increase to 14 or more. I am thinking my Lowrance units show 14.4 while running but I have an Optimax.
Ok i`ll check it . I have a multimeter. After that i`ll try and find the Regulator and see what youtube can tell me about it since i`ve never seen one .
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HE aka Fishbonz
Re: Tach stopped working but still lights up [Re: Fishbonz] #13855658 01/21/21 10:34 PM
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what XR4?.. 16 or 40 amp?.. if 16 it will have separate regulator and rectifier.. both or reasonably priced.. if its tha 40 it will have a combination (water cooled) regulator/rectifier.. its a high dollar item if you can find it...

Re: Tach stopped working but still lights up [Re: TLW] #13855666 01/21/21 10:46 PM
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Originally Posted by TLW
what XR4?.. 16 or 40 amp?.. if 16 it will have separate regulator and rectifier.. both or reasonably priced.. if its tha 40 it will have a combination (water cooled) regulator/rectifier.. its a high dollar item if you can find it...

Hey TLW! Thanks for chiming in! It`s a merc 150 blk max 1989. IDK the amps.

Last edited by Fishbonz; 01/21/21 11:21 PM.

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