Where to tap in for external Tach?
#1
Junior Member
Thread Starter
Join Date: Apr 2006
Location: Purgatory
Posts: 0
Likes: 0
Received 0 Likes
on
0 Posts
Where to tap in for external Tach?
Ok, so I am wanting to verify if the tach in my Bonne is off to determine if I actually ahve a high idle problem, so I have a Sunpro Super tach II laying here that I want to hook up to determine this. Where is the best place to hook it up? I know the white wire on the ICM harness is the tach wire, as I used the same one to tap into on my '94 Century and '96 Ciera. But, is there a easier way than cutting into the wire? TIA!
#2
Senior Member
True Car Nut
Join Date: Aug 2004
Location: In your garage, swipin' da lug nutz
Posts: 3,067
Likes: 0
Received 1 Like
on
1 Post
Not an easier way that I know of. You could use a vampire tap (or clamshell splice), under the fusebox cover in the engine compartment. That would be the most protected place that I can think of. Or, backprobe the white wire at the ICM connector with a paperclip.
#4
Senior Member
True Car Nut
Join Date: Aug 2004
Location: In your garage, swipin' da lug nutz
Posts: 3,067
Likes: 0
Received 1 Like
on
1 Post
Not while I am at work...but it should be easy enough to trace if you have a meter that shows you continuity. You will want to place one of those probes where the ICM harness connects to the main harness, and the other will have to be the prober for the white wire going into the firewall harness.
#8
Junior Member
Join Date: May 2006
Location: BonnevilleHell
Posts: 0
Likes: 0
Received 0 Likes
on
0 Posts
Re: Where to tap in for external Tach?
Originally Posted by Bonneville92V688
I know the white wire on the ICM harness is the tach wire, as I used the same one to tap into on my '94 Century and '96 Ciera. But, is there a easier way than cutting into the wire? TIA!
BTW, does your tach have setings for a V6? The tach signal is only going to be 3 pulses per revolution, not the 4 pulses of a V8 (which most aftermarket tachs come configured for.)
If you just want a place to test the tach signal comming out of the ignition, stick a straight pin into shell from the back (parrallel to the wire)...that way you can touch the contacts inside the shell without disturbing the wires.
Thread
Thread Starter
Forum
Replies
Last Post