Grounding sending units

Reply Subscribe

Thread Tools

Search this Thread

Jan 22, 2006 | 01:41 PM

dtony

Thread Starter

Junior User

Joined: Mar 2003

Posts: 86

Likes: 0

From: Albuquerque, NM

Grounding sending units

Hi all,

I have a 72 F100 with a 390 (I think). I have a cluster that had no guages working. I put new sending units for the oil and eng temp. The Oil pressure guage works great. The Eng Temp didn't work until I wired in a light with the + coming from the guage wire and the - grounded into the body. The guage seems to be working well now.

I was curious to know if the cluster may be missing a gound wire somewhere? My fuel guages doesn't work either unless I wire in some ground too. Has anyone heard of this before??

Thanks,

Tony in New Meixoc

Jan 23, 2006 | 09:09 AM

71 Sport Custom

Senior User

Joined: Jun 2004

Posts: 455

Likes: 0

Hello, If the ground wire from the engine intake to cab firewall isn't present,clean, and tight the gauges can be erratic.

Jan 23, 2006 | 09:20 AM

dtony

Thread Starter

Junior User

Joined: Mar 2003

Posts: 86

Likes: 0

From: Albuquerque, NM

A ha! Where would I find that wire???

Tony

Jan 23, 2006 | 09:31 AM

71 Sport Custom

Senior User

Joined: Jun 2004

Posts: 455

Likes: 0

It Should be on the upper rear of the intake and go to the firewall somewhere near the throttle linkage. If it isn't there it wouldn't be hard to add one.