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1989 s15 electrical problem Sign up here! Search this forum this category all forums for All words Any words Whole Phrase (search options) Auto Repair Home>> Automotive Repair>> Engine Troubleshooting bojo38 Novice May 2, 2008, 10:00 PM Post #1 of 4 (2593 views) 1989 s15 electrical problem Sign In I have a 1989 GMC s15 4.3 engine auto transmission and I have an electrical problem. The gauges do not work properly and when I turn on the headlight the volt meter drops to about half voltage. The heat gauge will not work properly or does the gas gauge and the dash lights will dim when I turn on the headlights. I have had the alternator checked and it is working fine. The check engine light has come on and also the check brakes light has come on and some times it will just flash on and off. If you hook a computer on to it the computer will say many things are not working properly but this has continued to get worse with time. I have my suspicions but would like some other opinions. Thanks for any help in advance. Tom Greenleaf Ultimate Carjunky / Moderator May 3, 2008, 6:19 AM Post #2 of 4 (2589 views) Re: 1989 s15 electrical problem Sign In I'd begin with checking and cleaning up all connections battery, alternator, starter and grounds. Look for burned wiring (fusible links) and any blown fuses. There could be a common ground to body that is causing many of the problems. Alternator checked off vehicle may test well - tests on the vehicle are more informative, T bojo38 Novice May 3, 2008, 7:11 AM Post #3 of 4 (2588 views) Re: 1989 s15 electrical problem Sign In Can you or any body else tell me were the common ground is on this pickup. I have replaced the battery cables and checked for fuses. This is what I thought it was but cannot find where the ground is located that control the inside of the cab or dash gauges. Thanks for you help. Tom Greenleaf Ultimate Carjunky / Moderator May 3, 2008, 7:27 AM Post #4 of 4 (2586 views) Re: 1989 s15 electrical problem Sign In Ok: The neg battery cable make one strong ground to the engine block. Either directly from the battery cable or elsewhere the body needs to be grounded as well. There are assorted ones throughout vehicles. I think you'll find one that goes from metal of firewall to back of engine - a bare strap used for ions for this. Others as needed and could be another between body and dash metal to make it a common ground. You should be able to safely add grounds when needed or just for testing as you may not find a broken orig. Did the orig (if even the replacement of battery cables were OE) have a separate ground wire on it - the old or the new one? Some come with them some don't. No harm in just using one jumper cable or even strong alligator clip jumper wire to add a good ground - just metal to battery neg and see if things are effected that don't work properly now. Those straps are old now and contact may be lousy or left disconnected by mistake, broken - who knows now? Just know that the metal of the body and frame are not automatically grounded by the battery cable to engine block alone. When the loop is unavailable item can try to seek ground thru other items and things go dim, don't work at all, and crazy stuff happens so grounding needs to be a known. You can use a simple test light for detecting a total absence of ground but it would light with the smallest amount, T   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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