I have a 91 740 turbo that has no rear break lights. I have checked all the regular problem area,but still have not got break lights. Switch works,but have nothing to the back of the car. Checked the bulb sensor , have signal in but nothing coming out.
Is there a way to buy pass this and check for other shorts, Or even test the suspected sensor.
In reply to IWELDIT:
If the bulb sensor has power going in, but not coming out, then you should replace it. FCP is my favorite place for Volvo parts.
http://www.fcpgroton.com/product-exec/product_id/17706/nm/1986_1992_Volvo_740_8_Valve_Bulb_Failure_Relay/category_id/171
I haven't ever looked at the pin-out for that relay, but I imagine that if you traced the wires going in and out, you could splice everything together and eliminate the relay. But if I remember correctly, the 740's relay panel behind the ashtray ain't easy to remove in order to do that. Lots of wires going in there.
Forums.turbobricks.com is a decent place to get Volvo maintenance information--just search their maintenance section.
Aaron
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