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TDR Application 3: Motorcycle Dual HID Start-Up Delay

Avoid hot-restrike or starting problems with dual HID ballasts and TDRs

Status: Units are built to order - Please expect up to 2-week delay after receipt of order until order is shipped


As in Application #2, on motorcycles with dual HID ballasts, it's a good idea to delay the turn-on of HID lights to make engine starting easier, and to avoid hot-restrike. However, if you wish or need to use two TDR relays, one for low beams and one for high beams, the standard TDR will not work, because there will be a long turn-on delay every time you switch between low and high beams.

To address this application, we now have the TDR-S, which only performs a turn-on delay when it is powered on. After this, the trigger inputs turn it on immediately, with no delay. This allows you to have one TDR for each headlight, and switch between them instantly after the initial turn-on delay.

This relay must be powered by an ignition-switched power source, not connected to the battery, or else the turn-on delay will not work. Because the power is ignition-switched, the turn-off delay is eliminated. Note that while the diagrams show power being pulled through the ignition switch, you should make sure your ignition switch can handle this before doing this on your vehicle. If your vehicle normally pulls current through the ignition switch to power the headlights, then this is OK. However, if your vehicle pulls current through a power relay for the headlights, then you'll need to use that relay to provide power to the TDR-S or TDR-PS relays.


Example 1: Dual HIDs with Dual TDR-PS Relays

Dual HID with Dual TDR-PS Diagram


Example 2: Dual HIDs with Dual TDR-S Relays

Dual HID with Dual TDR-S Diagram



Item Added!
Positive-Switching Start-Up Time-Delay Relay (TDR-PS)
Price: $64 / pair
Item Added!
Negative-Switching Start-Up Time-Delay Relay (TDR-S)
Price: $64 / pair