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Old 03-04-2016, 01:56 PM   #9 (permalink)
Diesel Mythbuster
Join Date: May 2005
Location: central illinois
Posts: 6,495
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Black / ground / negative / - should go to the engine.

From what I have seen our OEM cables could be bigger.

I get along fine using the side posts, but I do the battery bolt / Allen screw mod and still use dual post batteries in the biggest cranking amps I can get.

You can try using jumper cables, but the wire has to be as big or bigger than the wire in your cables. Don't look at the size of the outside coating, that means nothing. Many jumper cables are sold with over sized insulation to make them look bigger.

I never really figured out how to diagnose an ignition switch. It was usually the result of eliminating a bunch of other stuff. After I had to replace a few ignition switches at around 200,000 miles.

I got faster at deciding to parts swap instead of doing more diagnosing. I still did a fair amount of diagnostics, but from previous experience I thought of changing the ignition switch more as preventive maintenance and wasn't scared if it did not cure my issue. Every time I changed the ignition switch it cured my issue and the pints were arced when I took them apart.

Bad thing about parts swapping without diagnostics, is if you get a bad new part, you can be really scratching your head

I would only use a GM or AC Delco ignition switch.

I never had an issue with the double gang battery connections after doing the Allen screw / battery bolt mod.

Use only crimp on / solder on battery connectors - top post or side post. DO NOT use the cheesy clamps with the 2 - 1/4" bolts clamping the wires / cables to the terminal end
98 GMC Suburban 2500 6.5 4x4 160,000 mi, Fluidamper, remote PMD, FS2500
96 GMC 6.5 Suburban 1500 4x4 200,000 mi; Fluidamper, remote PMD, Amsoil bypass, K47 air filter
95 Tahoe 2 door 4x4 6.5 200,000 mi; Fluidamper, Amsoil bypass filter, remote PMD, K47 air filter
1989 GMC Sierra 2500 2wd 5 spd get-rag trans had 108,000 mi. in 92 when the odometer broke. 6-800,000 miles on the truck. Installed a GM crate 6.5 non-turbo in 2000 about 300,000 miles on the motor, original IP
95 Chevy 2500 xtra-cab 2wd 6.5 190,000 miles,
91 international 4700 low pro, spicer 6 speed, DTA 360 with 18' van box 500,000 miles plus.
NRA Life Member for over 30 years
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1994 chev K3500, FS2500 bypass filter, remore PMD, K47 air filter

Last edited by jrsavoie; 03-04-2016 at 02:06 PM.
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