Ok I got a good one for you guys. My interior fan speed switch doesn't work because of a shoddy a/c delete. No big deal, I hooked up a relay to the blower motor, battery, a switch under the dash, and fuse panel. It works perfectly except when the car is running and I want the heat on, my belt starts squealing and my volts gauge goes from almost 18 to 13. This happens every time I turn the fan on. It doesn't matter if my cd player or window defogger is on or not the belt squeals anyway. What did I do that would make the alternator harder to turn? I'm positive my water pump isn't at fault. Could my belt be loose or maybe my alternator bearings need to be replaced? Are you mystified too?

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82 z28 350cid, vortec heads, comp 262h cam, Holley 600cfm carb, 2in twice pipes, MSD ignition, turbo 350 trans, 3.73 posi, manly b&m megashifter

 

Perhaps some shoddy wiring is putting a load so great on the alternator that the belt starts to slip?

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'97 Bonneville SSE

 

Do you have the proper gauge wire?

 

I used 12 gauge wire for everything except a fused wire about 6 inches long to connect the relay straight to the battery which I could only find 10 gauge. I happens totally independantly of any other loads(wipers, cd player, window defogger, headlights). I am going to check the tension on my belt next. (even though I probably should have done that first)

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82 z28 350cid, vortec heads, comp 262h cam, Holley 600cfm carb, 2in twice pipes, MSD ignition, turbo 350 trans, 3.73 posi, manly b&m megashifter

 

I used 12 gauge wire for everything except a fused wire about 6 inches long to connect the relay straight to the battery which I could only find 10 gauge. I happens totally independantly of any other loads(wipers, cd player, window defogger, headlights). I am going to check the tension on my belt next. (even though I probably should have done that first) Could a resistor wired in the positive line to the motor possibly help?

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82 z28 350cid, vortec heads, comp 262h cam, Holley 600cfm carb, 2in twice pipes, MSD ignition, turbo 350 trans, 3.73 posi, manly b&m megashifter