Question about 1989 Volvo 740
Neither the speedometer or odometer are working - I know there's no speedometer cable on this car - is there a particulaar fuse that controls it that I should check - what fuse # would it be?
Your problem is NOT a fuse. The speedometer receives an electronic signal from an analogue transmitter mounted in the rear differential. It's the little button in the rear diff with two wires attached to it. Check to see if the wiring is chaffed or broken. If not, then it's probably the transmitter. A competent mechanic should be able to replace one for less than 200.00, parts and labor. If this does not fix it, then the problem is in the head, which can be expensive. You might get a used head if you can get a 90 day guarrantee on the part from the salvage company.
Posted on Oct 21, 2008
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Posted on Jan 02, 2017
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