Replacement Inboard Ignition Coil - Compatible with MerCruiser Thunderbolt IV and V Ignition Systems with HEI - Replaces 18-5438, 392-805570A2,

This ignition coil is designed for Mercruiser GM V-6 & V-8 petrol engines with Thunderbolt IV & V Ignition which includes engines 4.3L V6, 5.0L V8, 5.7L V8 (Inc 350 MAG), MX6.2L V8, 7.4L V8 (Inc 454 MAG), and 8.2L V8 (Inc 502 MAG). The coil is oil-filled and has a primary resistance of 1.7-1.8ohms and secondary resistance of 10.2K to 11.6K ohms. It requires an input voltage of 12-15v. The reviews for this product are mixed. Some customers have had good experiences and have stated that the coil works flawlessly or is of good quality at a low price. One customer also mentioned that their boat started getting a spark after installing it, which is positive feedback. However, many customers have had negative experiences with this coil. Several customers experienced their boat breaking down or having to get towed in after installing the coil. Other customers had issues with the coil failing within a short amount of time, despite it being a new brand. Additionally, some customers found it to be a junk part and had difficulty replacing it. One customer was disappointed that it took them a long time to figure out the coil was the problem and now the return window is closed. Overall, it seems that while some customers have had a positive experience with this ignition coil, many others have had negative experiences with it. It may be worth considering authentic Mercury parts instead to avoid these issues.