CCCUK logo

 ShipMyCar.co.uk

Website Control

Recent threads

New Forum Posts

» Radiator options? by Nosheruk on Sat 02 Feb 19 20:38

» Corvette C6 Coupe Wanted by Carl on Fri 01 Feb 19 14:38

» New Website and Forum by roscobbc on Fri 01 Feb 19 13:13

» Donington Historic May 3/4/5 by JonnyC4 on Fri 01 Feb 19 05:50

» CCCUK Website and Forum by Rich on Wed 30 Jan 19 21:55

» C6 Z06 Flat battery by Tattooboy on Wed 30 Jan 19 13:35

» WANTED C5 third brake light unit by roppa440 on Wed 30 Jan 19 12:16

» South Central Midlands Breakfast Meet by Daytona Vette on Wed 30 Jan 19 11:08

» V55 question for imported C2 by kentvette on Wed 30 Jan 19 09:16

» Transport & tyre recommendations by Johnd on Tue 29 Jan 19 15:38

» Turn signal lever cars with cruise by phill78 on Tue 29 Jan 19 13:12

» New Series of Wheeler Dealers an 02 Z06?? by 5 USA on Mon 28 Jan 19 20:21

» Hilarious quote of the weekend..... by roscobbc on Mon 28 Jan 19 18:10

» yellow metalflake vinyl steering wheel by Daytona Vette on Mon 28 Jan 19 17:29

» 74 c3 for sale by MIT on Mon 28 Jan 19 06:44

» Cooling system pressure tester kits by rayquayle on Sun 27 Jan 19 13:18

» Paid up member by Nosheruk on Sun 27 Jan 19 08:52

» Drifting your Corvette by Mule on Sat 26 Jan 19 13:09

» Newbie with a 76 by DAN@ADRIAN FLUX on Sat 26 Jan 19 11:40

» Spotted some well-hidden Z06 (C5) wheels for sale on flea-bay by VetteWeekend on Fri 25 Jan 19 13:34

» What did you do with your Vette today? by Forrest Gump on Tue 22 Jan 19 23:20

» New Unexpected Owner of this C3!! by alexm on Tue 22 Jan 19 21:46

» Power Windows by Jimbo64 on Tue 22 Jan 19 17:40

» radio suppressor ??? by 5 USA on Tue 22 Jan 19 12:50

» Any interest in used Z06 suspension? by Sub8 on Tue 22 Jan 19 11:18

» Rear wheel bearing by Clive on Tue 22 Jan 19 08:11

» Help with newly acquired 72 350 Auto by Jimbo64 on Mon 21 Jan 19 18:31

» This seems very cheap for a C7 by roscobbc on Mon 21 Jan 19 17:28

» Indicator/hazards switch by vet80y on Mon 21 Jan 19 06:36

» Front end parts for a 1973 C3 Small Block Auto by Lomaximus on Sat 19 Jan 19 15:28

Strange tacho



Reply to topic
View previous topicEmail to a FriendPrinter FriendlyView next topic

Author

Message

Dellb

Club Member

Thu 18 Oct 18 06:43

Strange tacho


Hi Guys
I seem to have a gremlin that I cannot track down. During the rebuild of my 1980 C3, when I had the dash out, I took the opportunity to replace the tacho board, and printed circuit.

During the build I changed the rad to aluminium with twin electric fans. I also upped the alternator to 110 amps.

When I turn on the ignition, the tacho goes to 0, telling me that I have 12V and earth.
All is fine until the fan kicks in. The tacho then becomes totally erratic and ending up at 7000. I am stumped. Any ideas?
Delb


--------------------
Derek L G

Reply with quote

kentvette

Club Member

Thu 18 Oct 18 11:44

Re: Strange tacho


As a "non-electrician" it sounds a bit like an earth problem.

But, one of the few things I do know about electrics is that the tacho circuit has a "choke" in it, (well it does in '78) located next to the distributor. In '78 there are, bizarrely, two plugs that are identical, one going via the "choke", one not. For a while, ours had the wrong one plugged in (not by me I should add!) and that did odd things to the tacho (it used to need about 30 miles running to get going!). The problem got noticed by chance at a transmission shop and they plugged the correct one in - no issues since. Just might be worth a look?


--------------------
Stephen J Irons
CCCUK Lifetime Member
Corvette Club France
Corvettes of Southern California
NCM Family Member
Stephen & June's Web Site
Red Corvettes Have More Fun!

Apple IS Genisys!
The "Born-Again Greenies" are killing the planet! It's time to wake up and smell the rain-forest burning!

Reply with quote

Reply to topic
View previous topicEmail to a FriendPrinter FriendlyPrivate MessengerView next topic


Permissions

You cannot post new threads in this forum
You cannot reply to threads in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot add events in this forum
You cannot attach files in this forum
You can download files in this forum