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Old 02-26-2017, 04:24 AM   #1
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Default 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
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Old 02-26-2017, 01:14 PM   #2
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See link

http://www.boatfix.com/merc/bullet/94/94_02.PDF

You ground the timing wire.
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Old 02-26-2017, 05:38 PM   #3
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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
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Old 02-26-2017, 08:34 PM   #4
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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.
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Old 02-27-2017, 12:23 AM   #5
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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
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Old 02-27-2017, 08:18 AM   #6
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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
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1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
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Old 02-27-2017, 12:27 PM   #7
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Quote:
Originally Posted by donald View Post
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
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.
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Old 02-27-2017, 05:29 PM   #8
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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
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Old 03-08-2017, 02:58 PM   #9
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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
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Old 03-08-2017, 04:55 PM   #10
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TB4 so your ignition module is mounted to the port riser and is triangle shaped?

Name:  TB IV Newer.JPG
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Old 03-09-2017, 12:00 AM   #11
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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
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Old 03-09-2017, 02:37 AM   #12
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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.
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Old 03-09-2017, 02:56 AM   #13
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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.
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Old 03-09-2017, 03:18 AM   #14
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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
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1987 Seaswerl 18ft C. Cabin 4.3 IO(lost in fire)
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Old 03-09-2017, 03:33 AM   #15
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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.
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Old 03-09-2017, 07:47 PM   #16
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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
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