Join Date: Sep 1999
Location: Dalton, Georgia
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Grounding/Charging Issue solved
Thanx for all the help on this issue. I emailed a few of you directly with this problem since I was was not getting anywhere posting.
For those who could benefit from the experince here are the details:
1. Swapped Vortec V6/TH350 into 88 YJ replacing 4cyl and 5 speed.
2. Used existing wiring for charging and grounding.
3. Previous motor had 8 gauge charge wire and 6 gauge negative cable.
4. Ground wiring between motor and frame none. Frame and body none. I suppose the motor mounts and such were adequate with the 38 amp alternator on the old motor.
5. New motor has 130 amp alternator and big power hungry computer.
6.Battery was dying after long prolonged night trips or using the heater for hours at a time.
7. Replaced battery cables with 2 gauge between + and starter, 4 gauge between + and fuse block and additional fuse block I added during swap, 1 gauge between - and block,
8. 4 gauge ground strap between block and body using external "star" washers for bite into the metal for a long lasting connection, and a 4 gauge ground strap between the block and the frame (using same washers).
9. 2 gauge wire between alternator and battery (this one does not get hot now!)
10. New battery
Now it works great!! It snowed over the weekend (12" in the mountains around NW GA - which is a bunch for this part of the country) and we drove into the mountains to wheel on some local trails. With headlights, off-road lights, heater, two-way radio, CB, and AM/FM at full tilt boogie, the battery charged and the insulation on all the battery cables stayed intact.
I think the problem was two things: no adequate or consistent ground and a charging wire that was too small to run all the new fangled electronics on this new engine.
Alternator whine was eliminated too!!
Hope this will remain in the archives for someone else to benefit from. A leeson I learned the hard way (one battery at a time).
88 YJ (sort of)