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Jan 23rd, 2013
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 Tach stopped working but still lights up
#13853079
01/20/21 05:47 AM
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Joined: Dec 2008
Posts: 6,756
Fishbonz
OP
TFF Celebrity
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OP
TFF Celebrity
Joined: Dec 2008
Posts: 6,756 |
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
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Re: Tach stopped working but still lights up
[Re: Fishbonz]
#13853292
01/20/21 02:40 PM
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Joined: Jul 2010
Posts: 1,249
boatman025
Extreme Angler
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Extreme Angler
Joined: Jul 2010
Posts: 1,249 |
Check regulator We can check it out for you if need us to
Hughes Marine
3855 Osage Lane
Wylie ,Texas
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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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Joined: Mar 2010
Posts: 22,703
T Bird
TFF Guru
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TFF Guru
Joined: Mar 2010
Posts: 22,703 |
Rotate the cylinder setting rheostat on the back of the tach several times and return it to the original setting. ![[Linked Image]](https://texasfishingforum.com/forums/pics/userpics/2021/01/full-47849-81860-44.jpg)
Okie by birth, Texan by choice. ![[Linked Image]](https://texasfishingforum.com/forums/pics/userpics/2021/01/full-47849-80883-111.jpg) USAF "Thunderbirds" Alumni 1985-1989
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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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Joined: Jan 2002
Posts: 1,589
Micheal
Extreme Angler
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Extreme Angler
Joined: Jan 2002
Posts: 1,589 |
What Boatman says. Tach gets it's signal from the regulator. Check and see if you are charging when the motor is running.
Micheal's Marine. Mobile Boat-Motor Repair Ser.
Dakota Lithium Battery Dealer
Lake Fork Trolling Motor sales and ser. Lowrance Dealer
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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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Joined: Dec 2008
Posts: 6,756
Fishbonz
OP
TFF Celebrity
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OP
TFF Celebrity
Joined: Dec 2008
Posts: 6,756 |
Check regulator We can check it out for you if need us to PM sent
HE aka Fishbonz
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Re: Tach stopped working but still lights up
[Re: Micheal]
#13853553
01/20/21 07:12 PM
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Joined: Dec 2008
Posts: 6,756
Fishbonz
OP
TFF Celebrity
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OP
TFF Celebrity
Joined: Dec 2008
Posts: 6,756 |
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
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Re: Tach stopped working but still lights up
[Re: Fishbonz]
#13853581
01/20/21 07:20 PM
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Joined: Jan 2002
Posts: 1,589
Micheal
Extreme Angler
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Extreme Angler
Joined: Jan 2002
Posts: 1,589 |
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.
Micheal's Marine. Mobile Boat-Motor Repair Ser.
Dakota Lithium Battery Dealer
Lake Fork Trolling Motor sales and ser. Lowrance Dealer
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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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Joined: Dec 2008
Posts: 6,756
Fishbonz
OP
TFF Celebrity
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OP
TFF Celebrity
Joined: Dec 2008
Posts: 6,756 |
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.
HE aka Fishbonz
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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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Joined: Apr 2004
Posts: 12,888
Stump jumper
TFF Guru
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TFF Guru
Joined: Apr 2004
Posts: 12,888 |
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.
2200 Bay Champ/200 Mercury Optimax
2017 Tundra TSS 4x4 Crewmax 5.7L
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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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Joined: Dec 2008
Posts: 6,756
Fishbonz
OP
TFF Celebrity
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OP
TFF Celebrity
Joined: Dec 2008
Posts: 6,756 |
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 . 
HE aka Fishbonz
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Re: Tach stopped working but still lights up
[Re: Fishbonz]
#13855658
01/21/21 10:34 PM
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Joined: Nov 2006
Posts: 2,797
TLW
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,797 |
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...
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Re: Tach stopped working but still lights up
[Re: TLW]
#13855666
01/21/21 10:46 PM
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Joined: Dec 2008
Posts: 6,756
Fishbonz
OP
TFF Celebrity
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OP
TFF Celebrity
Joined: Dec 2008
Posts: 6,756 |
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.
HE aka Fishbonz
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