tach issue.... - Team Camaro Tech
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post #1 of 5 (permalink) Old Oct 24th, 10, 10:00 PM Thread Starter
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Sean
 
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tach issue....

Got a tach off a guy today and disconnected the old one....hooked up the new one to the 69 with 383 with HEI....and it wont register..it just goes all the way around and stops around 10000rpm...I checked the wiring to make sure all is good

the red wire is hooked up to the side of the carb?...is that good?....the other tach's red cable was working this way...(the new one is a monster sport comp not sure if it matters with this or not)?...the black wire is connected to the starter...and the green/grey is connected to the Distributor (HEI)......do I need a filter with this set up?..

Or do I just have a broken tach?...Im skeptical about it now....Is there any way to fix the internals of the tach myself?..
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post #2 of 5 (permalink) Old Oct 25th, 10, 12:32 AM Thread Starter
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Sean
 
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Re: tach issue....

gonna take it to the shop in the a.m. ...I took the backing off, but I have no Idea what to look for...
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post #3 of 5 (permalink) Old Oct 28th, 10, 03:27 PM
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Todd
 
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Re: tach issue....

Best guess is it sounds like you have 12 volts/power going somewhere it's not suppose to.
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post #4 of 5 (permalink) Old Oct 28th, 10, 05:53 PM
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Steps
 
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Re: tach issue....

Quote:
the red wire is hooked up to the side of the carb?...the black wire is connected to the starter...and the green/grey is connected to the Distributor (HEI)......do I need a filter with this set up?..
DSiff makes can have diff colour coding...but that sounds a bit weird...
Generally there are 2 cicuits
1/ the dash light...connects to the instrument lights circuit in the car 1 one red red or coloured wires and the other grounded
2/ The tach...which all it does is measure pulse...the red or coloured to the 'tach' on the HEI (a GM hei its the tag farthest from the cap, marked 'tach') and the black to ground.

Ground the black wires..take one of the red/colured wires while the engine is running and connect to the tach terminat on the HEI....the one that makes the tach work is the right one...then connect the other to the instrument panel lights

If u have had the back off you should be able to figure out which wires go to the tach and which goes to the instrument bulb.

My Spelling is not incorrect...it is creative

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post #5 of 5 (permalink) Old Oct 30th, 10, 08:04 AM
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Keith
 
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Re: tach issue....

4 wires (color-coding can differ, so I won't mention colors specifically)

1. to a power source
2. for the light hookup (connected to the other uinstrument lights)
3. One lead to go to the tach spade ont he HEI
4. a ground wire.


I never heard of a tach wire connected ot the carb before...

Keith
1967 Camaro
406, 10:1, comp xr282HR, Dart Iron Eagle 200cc, Holley Contender dual plane, Holley 750 DP
Muncie M-20
GM 8.5, 3.73 posi
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