whacky speedometer


Old 06-21-03, 08:43 AM
david arrington
Visiting Guest
Posts: n/a
whacky speedometer

Speedo on my 1990 Dodge D150 goes wacky when driving with the OD unit on. It goes up and down erratically and causes the trans to shift up and down. With OD unit off it functions ok and the trans shifts ok. Mechanic said the speed sensor on the trans was bad he replaced. This did not fix the problem.

Any idea what to check or change so I can drive with the OD unit on?
Sponsored Links
Old 06-21-03, 01:34 PM
WeldGod's Avatar
Join Date: Mar 2003
Location: Texas
Posts: 616
I am not real familiar with that model of truck. But in a general sense I would make sure you do not have an OD cable bleeding signal over to the speedo cable. But if your truck as a mechanical speedo this would not be a concern.
Old 06-25-03, 08:42 PM
Visiting Guest
Posts: n/a
I had an electronic speedometer go wacky when the lights were turned on in a 95 Winnebago with P30 chassis.I replaced the $100 printed circuit card which didn't fix it. I was advised to replace the alternator and that cured it.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes