Re: RIP My 240; Whats the skinny on 740s
I drove the car today at slow speed, either first or second gear,
flicked on the high beams and it immediately stalled out so the problem
seems to have nothing to do with the overdrive relay. The car is
perfectly normal with headlights, it's only the high beams.
I looked for ground wires and the only one clearly visible was coming
directly off the negative battery post and it was attached to a
structural member near the right front wheel well. Things were a bit
cluttered on the left side and I didn't see any grounding there or near
the firewall which is a typical location on other cars. Do I have to
start removing stuff to see other ground wires?
Any wire I could see, ground or otherwise, appeared to have completely
intact insulation and no corrosion at contacts. There's not even a
trace of corrosion at my battery posts. I know that faulty grounds are
widely believed to be the root cause of many Volvo problems but thinking
a bit analytically it doesn't seem like a bad ground, which implies an
open circuit, could be the cause of this problem, i.e. switch on high
beams, open circuit in the headlight electrical path => car stalls makes
no sense. I could see some sense to a short being involved but I would
expect a fuse to blow in that case.
Any other ideas group?
don hodgdon wrote:
> "Roger Levy" <email@example.com> wrote in message
>>I'd like to follow up on two concerns cited by James and Michael. I
>>have an 87 740GL sedan with auto, 159K miles, that I've owned 5+ years.
>> It's running very nicely but it has two problems I'd like to fix. 1)
>>The roof liner is sagging in the rear, and 2) last week I flicked on the
>>high beams and the car immediately downshifted! I flicked them on and
>>off a few times and the car downshifted each time then it stalled while
>>traveling at 40 MPH. BTW, the car had an alternator problem several
>>weeks ago which I fixed by replacing the brush/regulator module and the
>>battery was fully charged when the stall occurred.
>>You guys said the liner and wiring harness are tough problems. I'm
>>guessing that the high beam issue indicates a short. Do you have
> I'd say the cheapest and easiest things to check would be the grounds. All
> sorts of strange things can happen on a 70 when the grounds start to fail.
> There are strips near the front of each inner fender where many of the
> underhood grounds are attached. Clean all the contacts and check the
> connectors for corrosion.
> You say the car downshifts when you flick the headlights...does the tranny
> actually downshift or is it the overdrive cycling on and off?