Livorsi tachs acting strange - need help please
#21
We checked that... paint has been removed were the modules are bolted up and nothing else has changed. This was a removal and re-installation by a builder. The ONLY thing different is the blocks are 502 blocks now instead of 454.
Engine to engine ground jump is the same too...
#22
Progress made!
We disconeected the alternators from the system entirely; removed the plug and the wires connecting to it... and the tachs worked..... BUT, the alternators work (are charging at least) because the gauges read 14 volts when connected and 12 when they are not.... looks like this has to be something in the harness to the alternators? the purple wire maybe?
Any thoughts around this? maybe an explanation of the alternators figure into the system? Somehow they send some kind of signal or interupt at about 3800 rpm that make the tachs goof out when connected. Again, thanks in advance for any feedback.
Any thoughts around this? maybe an explanation of the alternators figure into the system? Somehow they send some kind of signal or interupt at about 3800 rpm that make the tachs goof out when connected. Again, thanks in advance for any feedback.
#26
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That is a good one could be some paint on the block at distributor try reseting the timing, turn the dist a bunch of times to get a good seat, I have had to do this before.The purple wire is the ign feed wire out of the alt, I guess if a diode or something is bad it could do this but i have never seen or heard of something like this, But the other part of me says all you are doing is unhooking the ign system main power, But i could be wrong becouse it worked. Did the wiggel test do any thing? What is the temps of the alt, From what I have seen most run 120- 150 degress But I have seen them up to 290-300 in less then too min.
Last edited by Boat Tech; 04-27-2009 at 03:48 AM.
#27
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By unhooking the alternators you lower the system volts by 2-3 volts and that alone can make a big difference because of the less amp draw on each circuit.
Hook it back up and check for A/C voltage out the back of the alt if it is more than .5 volt replace it.
Also did you put in new pick up coils in the dist, I have seen this cause a few tach issues before.
I will be down to the lake this weekend delivering the Fountain if you don't have it fixed yet and let me know maybe I can take a quick look.
Hook it back up and check for A/C voltage out the back of the alt if it is more than .5 volt replace it.
Also did you put in new pick up coils in the dist, I have seen this cause a few tach issues before.
I will be down to the lake this weekend delivering the Fountain if you don't have it fixed yet and let me know maybe I can take a quick look.
#28
By unhooking the alternators you lower the system volts by 2-3 volts and that alone can make a big difference because of the less amp draw on each circuit.
Hook it back up and check for A/C voltage out the back of the alt if it is more than .5 volt replace it.
Also did you put in new pick up coils in the dist, I have seen this cause a few tach issues before.
I will be down to the lake this weekend delivering the Fountain if you don't have it fixed yet and let me know maybe I can take a quick look.
Hook it back up and check for A/C voltage out the back of the alt if it is more than .5 volt replace it.
Also did you put in new pick up coils in the dist, I have seen this cause a few tach issues before.
I will be down to the lake this weekend delivering the Fountain if you don't have it fixed yet and let me know maybe I can take a quick look.
I tried the wiggle test withthe cannon plug, it seems all good. But from the responses, I need to check the 5 and 7 plug wires in the loom, Alternators have not been changed probably in the last 7 years at least. I will check with Mike, the previous owner. I guess its possible they are bad even though they are charging the system? I also notice the volt meter on one of the motors kinda flutters a little and doesnt hold true like the other, but it has always done that.
Mark
#29
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Thanks John, I appreciate that.... i will be back down Friday night and doing more testing on it with my buddy Saturday morning.... I am in the same cove as the fountain you are delivering... Condos right across the cove, Cigarette is at the the end of the inside dock... Third from last slip... the very end slip is a 36' and always empty, feel free to pull in there. I will probably be there, would like to meetyou and say hello if nothing else!
I tried the wiggle test withthe cannon plug, it seems all good. But from the responses, I need to check the 5 and 7 plug wires in the loom, Alternators have not been changed probably in the last 7 years at least. I will check with Mike, the previous owner. I guess its possible they are bad even though they are charging the system? I also notice the volt meter on one of the motors kinda flutters a little and doesnt hold true like the other, but it has always done that.
Mark
I tried the wiggle test withthe cannon plug, it seems all good. But from the responses, I need to check the 5 and 7 plug wires in the loom, Alternators have not been changed probably in the last 7 years at least. I will check with Mike, the previous owner. I guess its possible they are bad even though they are charging the system? I also notice the volt meter on one of the motors kinda flutters a little and doesnt hold true like the other, but it has always done that.
Mark