I have a question, I have a 78 gmc tiltwheel pickup, its been shall we say, upgraded to what ever fits the owner at the time, its rusty, but I had everything working well, Then the blower motor seized up, so I installed a new one, and it would not work, I had to hot wire it from the fuse box, and then found out the turn signals wont work, I checked bulbs, and wires, and put in a new switch, and still, they dont work, I have power going into the switch, and the 4 ways work, and running lights, and brake lights, but no power coming out of the switch, for turn signals?, I tried 3 different flashers as well, Ground? bulb?. why would both heater fan, and signals stop together? I have read the blog about the turn signal relay. https://www.apogeeweb.net/electron/the-best-guide-to-the-turn-signal-relay-flasher-relay-test-and-faq.html But I am still confused... Is there anyone can help me? Many thanks.
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Lernend B. wrote: > I have read the blog > about the turn signal relay. That probably won't help much for your old car. I suspect an overload problem when either the old or the new blower motor drawed current and the fuse box became overloaded. You should probably dismount it and examine it on the backside. Chances are that a contact or a wire has gone awry and doesn't supply flasher and blower circuits. That could well be before the current even flows through the fuses. Old wires tend to become stiff and their insulation may disintegrate when moved, so be careful. Measuring voltage on the fuses may help to pin down the area where voltage disappears. And keep in mind that the old fuses themselves might have contact problems. Pulling them and reinserting might help here, and cleaning contacts might do, too. A few drops of WD40 will not do any harm.