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If you don't want to run ground wires for these items you had best make sure they have a clean unpainted, un-corroded ground
alternator
horn (s)
gauge (s)
headlight switch
some wiper switches
1st- The battery MUST be grounded to the engine. NO! Not the frame and then too the engine. Ever see a factory car with the battery to the frame rather than direct to the block? Sure their front mounted batteries. What about the original engine in your old car?
2nd- The frame and body must now be grounded to the block. Same bolt or area of the block is best. The shorter the path the grounds must pass thru steel and iron, the better
3rd- Steel is just as good you say? Consider this, Copper is the best conductor used in an automobile. Let�s call that 100%. Brass is only 22% and steel is only 16%, quite a loss? Yes, If I told you the starter was working on about 9 or 10 volts, you�d fix it quick? I think you would. Well, it�s working on a lot less than you think , so fix it. Battery to block, block to frame, block to body.
4th- What about the items mentioned above. IF they have a GOOD ground. Great. They might already be working. Did you clean the metal bare? Yes, rust is actually better than paint. You don�t mind scratching the rust off but you hesitate to clean off the paint? Must do...
5th- Gauges, lights, etc? On a steel car they might be OK. On Fiberglass cars it is a must to use a full grounding system. Most new cars are now getting full ground systems even with steel for good reason. Ever have a high beam indicator glow a little even when on the low beams? How about a taillight that doesn�t seem as bright as the other? Replaced the bulb and it didn�t fix it? Bulbs are either good or bad. No half bright. Have a turn signal that flashes faster on one side than the other? You have it...
6th- Switches? Steering columns? Why ground a switch or steering column? The headlight switch has an interior light switch built into it. If the switch isn�t grounded, that part of the switch can�t work. WIRE WORKS includes this ground wire. Trouble shooting calls have dropped significantly with this improvement
Steering columns? They have a switch for the horn. It closes the circuit to ground to operate the horn relay. No ground no horn. Bolting it into the steel dash will usually work. Not always and never if the mounts are against fiberglass or in rubber.
7th- Wiper switches often work off a ground also. Newer (1960 to 70's stuff)
8th- Gauges and Lights, like high beam indicator or turn indicators and interior lights need a good ground. Headlights , taillights and parking lights need a ground, you knew that. Did you know that if they�re dim or operate funny they need a better ground?
Gauges always need one except ammeters and hopefully I talked you out of that a long time ago. Still using one? Call me.....
9th- Using our GW-15 grounding terminal block is great for these smaller items. The block has a heavy feed wire that is connected directly to the battery or mounting bolt on the block near the starter. The starter is usually closer and completes the path with a heavier wire. Grounding directly to some battery terminals allows corrosion to built up on small wires which is more critical than just the heavy starter cable.
10th- The braided cables work good from the block to the frame and body both. Nothing should be over looked. You can run too many fuses but never too many grounds.
.Grounding headlights, especially Halogen bulbs to the bucket or fender is almost always an eventual problem
Electric fans draw buckets of juice. A separate ground wire to the central system location can keep you cool in more ways then one
You should take advantage of any accessory with a separate ground lead. Rather than shove this under a mounting bolt, run it to the central grounding area.
Horns are usually OK grounded to the steel body or frame.
Central grounding location makes troubleshooting great.
Electric fuel pumps and gas senders are usually easiest grounded to the frame. A separate ground to the central location is better
Master disconnects are best installed in the positive cable. This is especially important with electronic accessories or fuel injection
Typical battery locations require grounding the battery to the engine block and then a back up rear ground to the frame near the battery
Aluminum transmission and starter housings can sometime create electrolysis (corrosion) with dissimilar metal like brass battery cable lugs. It is best to run the ground cable to the cast iron block.
Use the engine as the primary ground connection and attach the frame, central grounding terminal strip and steel body to the same stud if possible.
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