Author Topic: Tach issues  (Read 17209 times)

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Offline Rosscoe

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Re: Tach issues
« Reply #20 on: June 16, 2015, 06:12:18 AM »
Makes sense it should be removed from the circuit to be tested for accurate results, BUT if it is charging the battery, doesn't that say something?
I would think there would be a way to check for the pulse/signal at the tach to see if its even getting one? I have proved the wire is unbroken.
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline Hyperacme

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Re: Tach issues
« Reply #21 on: June 16, 2015, 07:44:04 AM »
I'll check to see how mine's hooked up.
Give me a few minutes ...

Could we disconnect my tach lead from control box, and jumper it to your tach ?
Just to make sure that's the problem ?
I'm kind of busy this weekend ... but have next week off.

Offline Rosscoe

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Re: Tach issues
« Reply #22 on: June 16, 2015, 07:49:59 AM »
I'll check to see how mine's hooked up.
Give me a few minutes ...

Could we disconnect my tach lead from control box, and jumper it to your tach ?
Just to make sure that's the problem ?
I'm kind of busy this weekend ... but have next week off.

Maybe
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline Hyperacme

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Re: Tach issues
« Reply #23 on: June 16, 2015, 08:23:50 AM »
On wiring harness in engine, there are 4 wires.

Tan - not connected.

Brown / White - connects to a Brown / White and run up to control box.

Light Green / White - connects to an Aqua Green / White.

Light Blue / White - connects to a White.

The Aqua green and White run up to what look like mini solenoids with wires running down to the starter solenoid.

Offline Rosscoe

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Re: Tach issues
« Reply #24 on: June 16, 2015, 08:41:38 AM »
Mine looks pretty much the same. Tan is not connected. A couple of them are for the trim up and trim down solenoids.
I don't believe there is a wiring problem there. Its just the main harness and a couple of bullet connectors.
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline Rosscoe

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Re: Tach issues
« Reply #25 on: June 16, 2015, 08:46:47 AM »
It has got to be either the tach or the rectifier. Leaning towards the rectifier but the battery IS charging. Part is in the 45.00 range from what I am seeing. I hate just throwing parts in there though.
I did blow a fuse when wiring the bilge switch. I wonder if that could have taken out the rectifier?
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline Hyperacme

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Re: Tach issues
« Reply #26 on: June 16, 2015, 08:49:58 AM »
" A couple of them are for the trim up and trim down solenoids."

OK .. that what those are ...
Let me know if you want to try my boats tach leads.

Offline Rosscoe

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Re: Tach issues
« Reply #27 on: June 16, 2015, 08:56:55 AM »
OK
Think I'll try my J/E tach and see what that does. There has GOT to be a way to check for a signal/pulse at the tach. I'm looking all over the internet.
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline Rosscoe

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Re: Tach issues
« Reply #28 on: June 16, 2015, 08:59:22 AM »
your merc has a grey wire at the voltage regulator with engine running look for an A/C voltage reading if present check at tach grey wire and hopefully you will get same result,if so check for power and ground at tach as well should be battery voltage if all readings are ok than replace tach. As far as ACARR83 ,I think your tach signal is green so check for A/C power there at tach and power on yellow and ground
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline Rosscoe

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Re: Tach issues
« Reply #29 on: June 16, 2015, 02:06:51 PM »
Anyone have an idea as to where 12v should go on this old J/E tach I have? Nothing is marked. Maybe either terminal? Not sure why they'd put 2 unless for jumpering purposes. I just dont want to fry something if I havent already done so.
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline carlsoncvx18

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Re: Tach issues
« Reply #30 on: June 16, 2015, 02:27:03 PM »
Ross

I am not sure but maybe the different connecting points on the tach could be for different number of cylinder numbers.  Save you have 2 ,4, 6 cylinder motor. 
1987 CVX18.     1968 Glastron alpha sail boat
1977 GT150
1986 CV23
1984 Intimiadator
1981 CV27
1969 V-180 fundeck

Offline thedeuceman

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Re: Tach issues
« Reply #31 on: June 16, 2015, 02:34:36 PM »
i think i have one like that in my box of gauges.
i think it gets power and pulses from the grey wire, screw terminals select the number of pulses per rev (number of poles on the sataor).
Joe
75 GT150 "SeaDeuced"... Its Back !!
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Offline V153

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Re: Tach issues
« Reply #32 on: June 16, 2015, 04:12:45 PM »
Never seen one quite like that, must really be an oldie.

On mine purple is 12V+, black is ground, and grey is the signal from the stator.
'81 C500_given away, bought back_75.1 mph
'81 Baja 15SS_140 Frankenrude_66.7 mph
'70 something SpeedCraft_(Allison 16R Clone)_69.0 mph
'79 CVZ19_given away
'71 V153_54.8 mph_wrecked


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Offline V153

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Re: Tach issues
« Reply #33 on: June 16, 2015, 04:39:48 PM »
Yo Ross. Try the 'Marine Engine' or 'Iboats' Merc forum(s). Couple'a the guys over there really know their chit.
'81 C500_given away, bought back_75.1 mph
'81 Baja 15SS_140 Frankenrude_66.7 mph
'70 something SpeedCraft_(Allison 16R Clone)_69.0 mph
'79 CVZ19_given away
'71 V153_54.8 mph_wrecked


WALK TALL AND CARRY A BIG BILGE PUMP

Offline Rosscoe

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Re: Tach issues
« Reply #34 on: June 16, 2015, 07:55:18 PM »
Ross

I am not sure but maybe the different connecting points on the tach could be for different number of cylinder numbers.  Save you have 2 ,4, 6 cylinder motor.
Thats probably what the extra terminal is for. I think this thing is from the 60's so one of them is probably for a 2 banger and the other a 4 BUT as you can see, there are two wires on it (just as I received it) so I am guessing the two that are on there are a trigger/send and a ground, so only one of the other can be for 12v
I cant believe there are no markings.
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline Rosscoe

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Re: Tach issues
« Reply #35 on: June 16, 2015, 07:59:07 PM »
Like Joe and Doug said, I had assumed the gray was the signal wire. Maybe the one next to it is the difference between 2 and cylinder and that leaves the one next to the ground for 12v?
Kinda turning into a hassle just to find out of my tach is bad.
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline Rosscoe

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Re: Tach issues
« Reply #36 on: June 16, 2015, 08:01:53 PM »
your merc has a grey wire at the voltage regulator with engine running look for an A/C voltage reading if present check at tach grey wire and hopefully you will get same result,if so check for power and ground at tach as well should be battery voltage if all readings are ok than replace tach. As far as ACARR83 ,I think your tach signal is green so check for A/C power there at tach and power on yellow and ground

Guess I should try this.

I should also look at my own pictures. Two terminals are already tied. I'll see if I can find any kind of model number on it and do some research.
« Last Edit: June 16, 2015, 08:24:45 PM by Rosscoe »
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline Rosscoe

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Re: Tach issues
« Reply #37 on: June 16, 2015, 08:04:13 PM »
Yo Ross. Try the 'Marine Engine' or 'Iboats' Merc forum(s). Couple'a the guys over there really know their chit.

I'll check them out. Thanks
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag

Offline V153

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Re: Tach issues
« Reply #38 on: June 16, 2015, 08:41:24 PM »
Fwiw you probly won't 'smoke' the tach if'n the pulse setting/jumper is wrong. It just won't read right.
'81 C500_given away, bought back_75.1 mph
'81 Baja 15SS_140 Frankenrude_66.7 mph
'70 something SpeedCraft_(Allison 16R Clone)_69.0 mph
'79 CVZ19_given away
'71 V153_54.8 mph_wrecked


WALK TALL AND CARRY A BIG BILGE PUMP

Offline Rosscoe

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Re: Tach issues
« Reply #39 on: June 16, 2015, 08:51:20 PM »
That's cool as long as I don't smoke the rectifier! (if it isn't already toasted)
Ross
61 Surflite 1964 90HP Johnson project
67 V163 Bayflite Super Sport  1989 100HP Merc
67 V164 Bayflite 120HP
67 V174 Crestflite Rat Rod
71 V175 Crestflite 350ci -Jet
73 GT 160
84 CVX 17  83 115 Merc
88 CVX-23 350 Mag