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Automotive Technical Theory Forum

Professional automotive forum for discussion of the theory of operation for any automotive system or component. Discussions include electrical and electronic theory, engine propulsion theory, fuel system theory, ignition systems theory, and much more. This forum is for experienced automotive repair professionals only, membership required.

Continue to the description of our next automotive discussion forum, the Technical Tips Forum.

Recent Automotive Discussions in the Automotive Technical Theory Forum

2015 VW alternator charging information
01/17/2021 in the Technical Theory Forum
[Electrical: 15 Volkswagen Golf S 1.8L] This fine Golf is a bit of a challenge for us. It came in with fire suppression powder all over under the hood as a no start. Customer told us he was boosting it and the cables caught fire. We tested the battery an...
Alternator Output Fuses
01/12/2021 in the Technical Theory Forum
The October 2020 Motor Magazine "Foreign Service" Column is about a 300-amp fuse in series with the output of a 140-amp alternator. The alternator is on one side of the engine while the alternator's connection to the battery bus is on the other side, so t...
Using oxygen sensors to diagnose intermittent stall
01/09/2021 in the Technical Theory Forum
Customer with a GMC 4.3L (V6 with a distributor) pickup with very intermittent power loss/stall/ no restart. Was needing a tow every 2 weeks. Instead of spending all day to drive the truck, I sent it back with the owner and a data logger on the OBD2 port....
OBD2 code interpretation by the OE
12/24/2020 in the Technical Theory Forum
Friends, I am in the process of translating one of our online courses, Variable Valve timing into Spanish and I have run into a case history that is giving me grief. The author of the case history is a man I have complete confidence in, so I'm certain tha...
Voltage drop at fuses
12/18/2020 in the Technical Theory Forum
In theory, I love the ability to test for voltage drop at a fuse when looking for parasitic draw. The issue seems to be the design of fuses is not so easy to access. Many of the more recent production vehicles have fuses that there seems no easy way to ge...

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