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02-26-2017, 04:24 AM
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#1
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Captain
Join Date: Jun 2016
Location: Mn.
Posts: 664
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Question on TB V timing jumper!
 Does the jumper wire to put TB V into base mode have +12 v when key is on????
I have been looking at my engine a 5.7 A1 G2 1995 and the only wire I can find that resembles the wire to put it in base timing has been hooked up to the hour meter!
Any help and thoughts on this would be great!!!
Thanks!
Don
__________________
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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02-26-2017, 01:14 PM
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#2
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,632
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__________________
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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02-26-2017, 05:38 PM
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#3
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Captain
Join Date: Jun 2016
Location: Mn.
Posts: 664
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Thanks Mike!
Good info, but my question is there 12v+ on that wire?
PO put a hour meter and connected it to what looks like the timing lead!
I have looked all over the engine and that is the only wire even remotelyresembles the timing wire!
So was wondering if that was it and what would happen if it was used as a power source for a hour meter?
Thanks!
Don
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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02-26-2017, 08:34 PM
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#4
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,632
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Donald I'm not sure if it is a steady 12V or pulsed but either way I would not use it as a source to power an hour meter or anything else. Depending of the impedance of the hour meter it may be close enough to ground that the computer is stuck in base timing mode.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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02-27-2017, 12:23 AM
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#5
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Captain
Join Date: Jun 2016
Location: Mn.
Posts: 664
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Thanks Mike!
I am going to look into it more! Will have to take a closer look at the wire colors and try and see if that is the wire for timing or not!
I should only be 4ft. 6in. and a only about 80lbs., not 6ft. and 212lbs. and 40 years younger!
Thanks again!
I will keep looking!
Don
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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02-27-2017, 08:18 AM
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#6
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Captain
Join Date: Jun 2016
Location: Mn.
Posts: 664
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Just so everyone knows, I found the Merc manual on line, and it had the info I was looking for!
The pink/white wire used to set base timing on Mercruiser TB V has 8 to 10 v+ DC!
It is also the wire that goes to the knock senor!
Thanks for all the help!
Don
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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02-27-2017, 12:27 PM
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#7
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,632
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Quote:
Originally Posted by donald
Just so everyone knows, I found the Merc manual on line, and it had the info I was looking for!
The pink/white wire used to set base timing on Mercruiser TB V has 8 to 10 v+ DC!
It is also the wire that goes to the knock senor!
Thanks for all the help!
Don
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Don just because it has DC does not mean it should be used to supply power to an accessory. it is coming from the ECM which may be damaged if a heavy load is applied. It was not designed as a power tap.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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02-27-2017, 05:29 PM
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#8
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Captain
Join Date: Jun 2016
Location: Mn.
Posts: 664
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Mike, I agree, a PO I assume the a PO installed it.
I will do more checking into what the hour meter is hooked to, and see if that is in fact the timing jumper!
Thanks for all the info and help!
Don
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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03-08-2017, 02:58 PM
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#9
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Captain
Join Date: Jun 2016
Location: Mn.
Posts: 664
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Good Morning All!
Just found out that I do not have TB5!
Contacted Mercury Marine with engine # and I have a TB4!
The wire that has the hour meter connected to it is the ing. wire from switch!
Thanks to all who helped!
Don 
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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03-08-2017, 04:55 PM
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#10
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,632
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TB4 so your ignition module is mounted to the port riser and is triangle shaped?
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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03-09-2017, 12:00 AM
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#11
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Captain
Join Date: Jun 2016
Location: Mn.
Posts: 664
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Hi Mike!
No it is on the distributer, It dose not have the triangle bracket on it!
I got this info from Mercury Marine so I guess it is correct!
Don
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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03-09-2017, 02:37 AM
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#12
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,632
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Don I'll do some reading when I have time but my memory tells me otherwise, but then again my memory is not what it used to be. 
Can you post a picture? Also the TBV will have two modules on the distributor one being for the ignition and the other is the knock module.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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03-09-2017, 02:56 AM
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#13
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,632
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A quick search does revel that the last revision of TBIV was a distributor mounted module but I cannot determine what year the TBV came out. But as I said the TBV has the knock module.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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03-09-2017, 03:18 AM
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#14
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Captain
Join Date: Jun 2016
Location: Mn.
Posts: 664
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Hi Mike!
I have the 1995 Mercruiser owners manual and it states that to set the timing
" A special procedure must be followed for adjusting idle RPM and to adjust the timing".
But it does not specify which system!
I have looked at mine and it has the module on the distributer, w/o knock module! (Very tight as distributer sets under the aft deck!)
It does not say when the TB5 came out, but I have to believe the Merc folks!
Anyway I will treat it as a TB4!
Thanks
Don
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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03-09-2017, 03:33 AM
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#15
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Admiral
Join Date: Feb 2012
Location: Essex, Maryland
Posts: 10,632
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Hi Don, no special procedure really other than carb should be adjusted first at idle then set the timing. Good luck.
__________________
1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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03-09-2017, 07:47 PM
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#16
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Captain
Join Date: Jun 2016
Location: Mn.
Posts: 664
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Morning Mike!
That is what I was planning to do!
I like KISS ! ( Keep It Simple Stupid! )Because sometimes I am that guy!
Don
__________________
__________________
1995 Maxum 2400 SCR 5.7 A1 G2 LUNA DE MIEL SOLD
1988 Bayliner 2455 5.0 IO (sold)
1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
2012 South Bay Pontoon
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