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General Site Info => General Discussion => Topic started by: pewster on October 05, 2009, 09:14:31 pm

Title: speeometer wires?
Post by: pewster on October 05, 2009, 09:14:31 pm

I have a question about a speedometer I got in a junkyard from a 90 suburban. It has a trip meter and has 3 wires that go to a little box that then goes to a plug that you can unplug from the truck harness. The speedo seems to work ok with these wires unplugged, just wondering if anyone knows what the heck they do. I haven't checked it out on the road yet, just spinning it by hand.

Title: Re: speeometer wires?
Post by: zieg85 on October 05, 2009, 09:30:24 pm

Probably for the cruise control

Title: Re: speeometer wires?
Post by: pewster on October 05, 2009, 09:54:53 pm

Thanks. Didn't think about that. I'm putting the gauges in my 80 chev c-30 and it doesn't have cruise. Does anyone have the schematic for the cruise option?

Title: Re: speeometer wires?
Post by: zieg85 on October 05, 2009, 10:07:22 pm

I don't but I am always looking for a parts truck with a complete "working" unit to put in my 85. 

Title: Re: speeometer wires?
Post by: Captkaos on October 06, 2009, 11:34:36 am

Have you looked at the diagrams in the tech forum?  There should be one in the 81-87 that lists the speed sensor.

Title: Re: speeometer wires?
Post by: Marc on October 06, 2009, 05:59:51 pm

On an 87 that's a speed sensor.  Don't know when they went to the transmission mounted one.