LT1 Electrical Concern
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Registered User
Joined: Jun 2010
Posts: 2
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From: Mechanicsburg, OH
LT1 Electrical Concern I have a 94Z8 that I’m adding bolt on upgrades to. In the process of adding parts like an MSD ignition / Electric water pump ect. I discovered a potential problem. While double checking my wiring prior to hooking the battery up and doing a test fire – I’ve found an area of concern while using an OHM meter. With 1 lead touching a positive feed in the junction block (Red Oval box on the passenger side of the car) and the other to a chassis ground – my meter reads ~2.5 on the 200k setting. I expected to find no reading on the meter, which has lead to a lot of probing on the car. I’m at a complete loss and need help. The factory wire harness had three sets of wires that hook into that box. There is one set of Red wires (two hooked together by a ring terminal) each with a fuse link, that when measured to a ground report 0ohms on my meter. Those wires feed into the fuse block. The car does start, and run well with no hesitation. At ~700rpms the voltage guage in the car is lower then expected, but quickly jumps to 14.2v or higher at 1000 +. I attributed this to the BBK pulley – not sure if that’s true or not. My greatest concern though is the readings I pick up while probing positive feed wires to a chassis ground. Am I chaising a non-issue?
IIRC that box is always hot, and yes the fluctuation in voltage can be from an underdrive pulley. The solution is to use an overdrive pulley on the alternator. If you do not you may end up w/ a dead battery in a few months.
TECH Veteran
Joined: Dec 2008
Posts: 4,147
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From: Little Rock, AR
I... I’ve found an area of concern while using an OHM meter. With 1 lead touching a positive feed in the junction block (Red Oval box on the passenger side of the car) and the other to a chassis ground – my meter reads ~2.5 on the 200k setting. I expected to find no reading on the meter, which has lead to a lot of probing on the car. I’m at a complete loss and need help. .... Am I chaising a non-issue?
