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03-24-2018, 01:43 PM #15000 RPM
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Tach Question on new build... where to start looking?
I have a rebuilt 2002 carbed 2.5L 200HP I put in the water for the first time this morning. Engine was new top to bottom. New CDI Stator / Trigger. New voltage regulator, although i used a cheap china one.
Fired the engine up and ran great. First time i went to run up to 2K RPM's I noticed the tach wasn't moving. It just sits at about 1K and bounces quite a bit (you can tell the engine isn't bouncing around as much as the tach indicates). Shut the motor down and disconnected the grey wire from the voltage regulator, plugged back in and fired up. Throttled up to ~2K, tach starts to work then immediately does the same thing. Faster i go, the slower the bounce. Engine runs great otherwise. All the rest of my electronics seem to work fine.
Also the voltage is running at 14.4. Is that too high?
Tach worked fine when I pulled the other motor out ~2 weeks ago.
Any ideas where to start looking? Could it be the voltage regulator?
Thanks,
Chris
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03-24-2018, 09:17 PM #2
Try swapping the grey wire to other regulator and see if still does it. If it does it's tach or wiring problem. If it does not swap yellow wires from stator between the two regulators and see if it's still ok or starts back doing it. If starts back it's stator, if not it's the regulator. (If you can swap the stator wires on the cdm set up, for the life of me can't remember if lengths will let ya)
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WillySteve liked this post
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03-25-2018, 12:00 PM #3
If the tach is working with the grey wire disconnected you have a harness issue.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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03-25-2018, 01:30 PM #45000 RPM
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Thank you both. Disconnected the grey wire and tach stopped working. Pulled the voltage regulator off the other motor and replaced the new one, and the issues appears to be resolved (at least on the trailer). I'll go dump the boat in the river once the rain stops. Thank you for the help.
Does someone make a better voltage regulator?
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03-25-2018, 01:37 PM #5
Mercury has an updated regulator, expensive but replaced both on my Pro Max fee years ago and work great.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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03-25-2018, 02:22 PM #65000 RPM
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03-25-2018, 02:39 PM #7
883071A 1 these are fused and must change wiring slightly. Instructions come in the box.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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03-26-2018, 05:30 PM #8
Don't forget to switch the little cylinder dial on the back of the tach back and forth 15-20 times and then put it back where it started!
Those contacts get dirty on a regular basis and will make the tach do stupid things!!!WillySteve Hendricks
20XDC Bullet/Modified Merc 260
295TF Charger/ProMax 225x-Sold!
'83-20' Contender Pickle Fork/Merc 2.4 ModVP BridgePort EFI-Sold!
'85-18' Stratus STV/Merc Hi-Po 2.4 EFI-Sold!
Freedom 240 DLX Fisher Toon/Merc 115
10' Cougar Cub/Merc 25HP On The Bottle!
18" Home Made Tunnel/OS .021XM Outboard on 50% Nitro and Expansion Chamber
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