GrayWolf Posted March 18, 2018 Share Posted March 18, 2018 While putting in a new radiator I noticed a ceramic resistor on the drivers side of the engine compartment and it's split down the long length and held together by two wire ties. Went to two two different parts stores and no one could find anything matching the number on mine or tell me what it might be. Anyone have a part number and brand for a 1990 4.0. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 18, 2018 Share Posted March 18, 2018 It's the fuel pump ballast resistor, ~1.3 ohms value. You can replace it with any similarly configured porcelain power resistor of the same value. The Standard RU-13 is a good choice and it has the more secure ring terminals. Link to comment Share on other sites More sharing options...
carnuck Posted March 18, 2018 Share Posted March 18, 2018 12 hours ago, HOrnbrod said: It's the fuel pump ballast resistor, ~1.3 ohms value. You can replace it with any similarly configured porcelain power resistor of the same value. The Standard RU-13 is a good choice and it has the more secure ring terminals. Napa replacement number is ICR13 or ICR13sb. It was added to the fuel pump feed to cut down the noise. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 18, 2018 Share Posted March 18, 2018 2 hours ago, carnuck said: Napa replacement number is ICR13 or ICR13sb. It was added to the fuel pump feed to cut down the noise. That one has the crappy push-on terminals like the OEM resistor. They get loose over time and can fall off. Link to comment Share on other sites More sharing options...
PIKE Posted March 19, 2018 Share Posted March 19, 2018 Is there a difference in the RU-13 and the RU-13T ? Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 19, 2018 Share Posted March 19, 2018 4 minutes ago, PIKE said: Is there a difference in the RU-13 and the RU-13T ? None that I know of. They are both have the same ohms and wattage rating so either will be fine. Link to comment Share on other sites More sharing options...
rokinn Posted March 23, 2018 Share Posted March 23, 2018 Bought the RU-13. Labeled on the unit itself as 1.6 ohms. Stock unit is labeled 1.1 ohms. Stock unit reads with my ohm meter (Craftsman) as 1.6. RU-13 reads 2.2 ohms. Any thoughts as to appropriateness of the "upgrade." Switching from closed to open cooling and looking to relocate as well as upgrade this unit. Link to comment Share on other sites More sharing options...
HOrnbrod Posted March 23, 2018 Share Posted March 23, 2018 Been using a 1.6-ohm for years. It'll work fine. https://comancheclub.com/topic/54891-ballast-resistor-poll/?tab=comments#comment-562647 Link to comment Share on other sites More sharing options...
Skorpyo Posted March 23, 2018 Share Posted March 23, 2018 They're pretty cheap so buy two of them. I always keep my spare in the glove box. Link to comment Share on other sites More sharing options...
DirtyComanche Posted March 24, 2018 Share Posted March 24, 2018 6 hours ago, Skorpyo said: They're pretty cheap so buy two of them. I always keep my spare in the glove box. You can just bypass it if it actually fails. At least for long enough to get a new one. Link to comment Share on other sites More sharing options...
gogmorgo Posted March 24, 2018 Share Posted March 24, 2018 Or forever... Link to comment Share on other sites More sharing options...
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