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88Formula88
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JUN 25, 03:39 PM
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Hello all! New member here and I am very impressed with the Fiero community. You guys and gals are very helpful and passionate. I am lucky enough to own an 88 Formula that I purchased in pieces and have finally got it running and back together.
I have a new battery but returned home from 4 days not driving the car to a dead battery. I have run a test on the fuses to determine fuse 8 is sending .2A when the car has been off for over an hour, no key in. I have also noticed that the trunk light and horn do not work (I even tried a new bulb). Additionally, I have noticed there is a 25A fuse in the CTSY (fuse 11) spot but the fuse diagram shows it should be a 20A.
I am not familiar with these cars or troubleshooting wiring issues and was wondering if the community could help me figure out where to start with solving my issue of parasitic drain/other issues. Thanks in advance! 
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sleek fiero
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JUN 25, 05:06 PM
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.2 amp should not run bat down in 4 days. I would suspect courtesy light or similar causing the issue. I would use a voltmeter and connect between bat neg and ground and pull fuses one at a time until you get an open circuit. That will be the circuit that is causing the draw. If you own a power probe its even easier to search for problems. My trunk light switch was causing me grief until I realized the paint shop had adjusted the trunk lid without readjusting the light switch.
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88Formula88
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JUN 25, 05:17 PM
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Hey, thanks for the quick reply! I also adjusted the trunk lid switch and still couldn’t get it to function properly. Well, the bulb doesn’t work at all so I guess I really can’t test the switch yet.
I will do the voltmeter test, but should the car be running? Then I assume whatever circuit is my issue I just have to trace all those wires and likely have an open ground or something somewhere to address?
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Patrick
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JUN 25, 05:45 PM
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| quote | Originally posted by 88Formula88:
I will do the voltmeter test, but should the car be running?
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Absolutely not! 
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Patrick
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JUN 25, 05:56 PM
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| quote | Originally posted by sleek fiero:
.2 amp should not run bat down in 4 days.
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I had posted Here about parasitic battery draw issues I was experiencing. My Subie had a draw of 200mA (which I believe is the same as .2 amp) and it was killing the battery within a week. I realize of course that four days is shorter than one week, but depending on the state of the battery, couldn't a .2 amp draw be killing the OP's battery within those four days?
Full disclosure... electronics is not my strength. 
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Dennis LaGrua
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JUN 25, 05:59 PM
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One point of current draw problems on Fieros is sometimes the headlight motors. Pull the connectors and see if that solves it.
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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE " [This message has been edited by Dennis LaGrua (edited 06-25-2023).]
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Patrick
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JUN 25, 06:38 PM
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| quote | Originally posted by Dennis LaGrua:
One point of current draw problems on Fieros is sometimes the headlight motors. Pull the connectors and see if that solves it.
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Dennis, I believe that was more of an issue with the 1st gen headlight motors... '84-'86. Do the 2nd gen motors ever actually suffer from this issue?
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shemdogg
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JUN 25, 08:29 PM
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