So I'm thinking now that perhaps the only problem is that I don't drive it enough (which, by any normal measure, is true) and that the battery cutoff switch I fitted a couple of years ago is the right solution. ![]() Pulling the towing fuses had no effect at all (although pulling the dome fuse at the 160mA level immediately took the current down to 90mA). With the key taken completely away, it dropped to around 160mA for perhaps 20 minutes then falling to about 20mA, where it stayed indefinitely (unless I brought the key back, or opened or closed the bonnet latch - then temporarily back to 500mA, etc). It jumped up to (and stayed at) around 500mA with the key fob close to a front door, and it settled around 200mA with the key a few feet further away. I did a bit of experimentation today and found no evidence of a problem with the towing electrics - or anything else for that matter! After a settling down period (around 20 minutes), residual current was only about 20mA. I would be grateful for any thoughts on whether replacing the dedicated electrics kit with an old-fashioned generic bypass relay (powered straight from the battery) would be likely to cure the premature discharge? Or whether that would be unwise with modern electrics?Įlekie doctor's comments appear to have been spot on. In the past, I've fitted generic towing bypass relays to a number of cars (always with a 12v permanent feed taken back to the battery) and never had a problem with any, although the most recent of these was a 2004 C-class. I suspect (but am not certain) that the problem might be due to the Toyota installation using only a permanent feed. However, the kit (despite being Toyota branded) was made by Westfalia, and I've recently noted on the internet that Westfalia acknowledge battery discharge problems with some of their towing relays where only a single 12v feed is used, instead of a permanent feed and a switched feed. It's only a minor inconvenience (as I now use a battery isolator when parking for extended periods) but ideally I would like to fix the issue one day.Įverything works as it should, and the electrics are Toyota's official kit (bought from Toyota and a plug in fit). ![]() The first one lasted a week or two, and the. My old solenoid recently went out (I think it was a Trombetta Fatboy) and the tech replaced it with an Intellitec Big Boy Battery Isolator Relay 77-90006-120. My otherwise perfect (literally!) 2014 RAV4 has been prone to run down its battery prematurely since fitting towing electrics 4 or so years ago. Battery Isolator Relay (solenoid) Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
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